Fan:Digimon: Millenniummon Descends (2022 film)

Digimon: Millenniummon Descends is a fanon live-action film idea created by CAJH. It is the sequel to Digimon: Fight for Survival and Digimon: Dramon’s Roar, the fourth and the final installment of the Millenniummon Arc, and the seventh installment of the fanfictional multimedia franchise idea. The story of the film is inspired by several elements from 1999 Adventure and 2020 Adventure: continuities as well as few recurring elements from Digimon mythologies. The story of the film starts one year after the events of Fight for Survival but features a series of flashbacks from the time between.

The initial story idea of Digimon: Millenniummon Descends was released to the Digimon Wiki on January 2023. The ”Digimon 2021 Fan Fiction Universe Story Idea Group” is also actively recruiting other people to suggest their own ideas or story changes for a potential full script.

Story
Version 1.2.2. Last updated on November 24, 2023.

Some story elements have not been fully planned, but other contributors are to write their own suggestions in the talk page.

Junior Chosen Children

 * Dyson Motomiya, 15 years old Japanese American boy who is Hikari’s and Tyler’s classmate. Based on Daisuke "Davis" Motomiya. He is the carrier of the Crest of Miracles and one of the secondary carriers of the Crests of Courage and Friendship. He is also partnered with Veemon who can evolve into ExVeemon, super fuse with Stingmon into Paildramon, with help of the Crest of Kindness, and mega evolve into Imperialdramon Dragon Mode. Imperialdramon also learns to switch into Knight Mode and becomes temporarily empowered to assume Heavenly Mode.
 * Kenneth ”Ken” Ellsworth, a 16 years old prodigy who was formerly known as the Digimon Emperor. Based on Ken Ichijouji. He is the carrier of the Crest of Kindness. He is also partnered with Wormmon can evolve into Stingmon and learns to super fuse with ExVeemon into Paildramon, with help of the Crests of Courage, Friendship and Miracles. Imperialdramon also learns to switch into Knight Mode and becomes temporarily empowered to assume Heavenly Mode.
 * Milena Iglesias, Tyler’s 16 years old Mexican American neighbor. Based on Miyako "Yolei" Inoue. She is the secondary carrier of the Crests of Love and Sincerity. She is also partnered with Hawkmon who can evolve into Aquilamon and super evolve into Sigurdmon with help of the Crest of Light.
 * Evan Hill, Tyler’s 12 years old neighbor with mature personality despite his young age. Based on Cody "Iori" Hida. He is the secondary carrier of the Crests of Knowledge and Reliability. He is also partnered with Armadimon who can evolve into Ankylomon and super evolve into Shakoukimon with help of the Crest of Hope.
 * Tyler Whitaker, Matt Jephson’s 15 years old brother who lives with his mother Nancy. Based on Takeru "T.K." Takaishi. Carries the Crest of Hope. He is partnered with Patamon who can evolve into Angemon, super evolve into HolyAngemon, and mega evolve into Goddramon. Patamon also carries the spirit of Devimon, the former embodiment of his dark side.
 * Hikari Yagami, Taichi Yagami’s 15 years old sister. Based on Hikari "Kari" Kamiya. Carries the Crest of Light. She is partnered with Tailmon who can super evolve into Angewomon and mega evolve into Holydramon. Tailmon also carries the spirit of LadyDevimon, the former embodiment of her dark side.
 * William ”Will” Dunham, 16 years old boy who lives in Colorado. Based on Willis. He is the carrier of the Crest of Destiny. He is partnered with Lopmon who can evolve into Tueryemon and learns to super evolve into Andiramon.

Senior Chosen Children

 * Taichi Yagami, Hikari’s 18 years old brother. Based on Taichi "Tai" Kamiya. Carries the Crest of Courage. He is partnered with Agumon who can evolve into Greymon, super evolve into MetalGreymon, change into Alterous Mode, mega evolve into WarGreymon, and mega fuse into Omegamon with MetalGarurumon. Omegamon becomes temporarily empowered to assume Heavenly Mode.
 * Matthew ”Matt” Jephson, Tyler’s 18 years old brother who lives with his father Harry. Based on Yamato "Matt" Ishida. Carries the Crest of Friendship. He is partnered with Gabumon who can evolve into Garurumon, super evolve into WereGarurumon, change into Sagittarius Mode, mega evolve into MetalGarurumon. Omegamon becomes temporarily empowered to assume Heavenly Mode.
 * Sonya Tarkovsky, Taichi’s friend and classmate for many years. Based on Sora Takenouchi. Carries the Crest of Love. She is partnered with Piyomon who can evolve into Birdramon, super evolve into Garudamon, and mega evolve into Hououmon.
 * Connor Smith, Taichi’s 17 years old neighbor who is a computer genius. Based on Koushiro "Izzy" Izumi. Carries the Crest of Knowledge. He is partnered with Tentomon who can evolve into Kabuterimon, super evolve into AtlasKabuterimon, and mega evolve into HeracleKabuterimon.
 * Mimi Thwaites, a rich girl and Connor’s classmate. Based on Mimi Tachikawa. Carries the Crest of Sincerity. She is partnered with Palmon who can evolve into Togemon, super evolve into Lillymon, and mega evolve into Rosemon.
 * Joseph ”Joe” Kent, a 19 years old young man who plans to become a doctor. Based on Joe Kido. Carries the Crest of Reliability. He is partnered with Gomamon who can evolve into Ikkakumon, super evolve into Zudomon, and mega evolve into Vikemon.

Allies

 * Chris Murdock, FBI Agent who is part of a task force that works with the Chosen Children on behalf of the U.S. Government. He greatly trusts in the government, but the Chosen Children make him question the methods of the grown-ups.
 * Qinglongmon, the Eastern Sovereign Beast who, along with the Sovereign Beasts, has guarded the Digital World since the destruction of the original Apocalymon. He has faith in the Chosen Children, and assisted Jesmon to ensure that the children will defeat Millenniummon.
 * Huckmon, the messenger of Kernel, the living core of the Digital World. Based on both Gennai and Adventure tri. incarnation of Huckmon. The Kernel gave him an ability to mega warp evolve into Jesmon but he and Qinglongmon rebel against the Kernel to give the Chosen Children a chance to prove that they can defeat Millenniummon.
 * Andromon, a resident of the Dome City and a former prisoner of the Disciples of Apocalymon.
 * Elecmon, a Digimon caretaker of the Village of Beginnings.
 * Spadamon, Leomon’s former lieutenant and apprentice and the current Digimon resistance leader against the Dark Digimon.

Enemies

 * Millenniummon, a powerful Composition Digimon who was resurrected by the Disciples of Apocalymon to fulfill their deceased master’s dying wish to destroy the Digital World. Every destruction it causes is slowly breaking the dimensions, and its size and dimensional powers grow even bigger when its transforms into ZedMillenniummon through dying.
 * The Extension Digimon, puppet-like Digimon acting as Millenniummon’s anti-bodies to fight for him while he is still immobilized by the Sleep Mode of the Digital World.
 * Nowell Sharpe and Piemon, a young misanthropic man and the original Disciple who are now fused into a being who acts as the very avatar of Apocalymon, a Digimon who was formed from the Digimon who did not survive natural evolution and wanted to destroy the two worlds to avenge their unfair lives.
 * Julius Oatway, Nowell’s former mentor and a childhood friend of the Junior Chosen Children’s parents. His childhood dream has been to see the Digital World with his own eyes. He is now a therapist trying to encourage young people fulfill their dreams, but is secretly brainwashed by Nowell, who works as his assistant and is using Oatway to turn regular children away from the light of hope and against the Chosen Children. He is partially based on Yukio Oikawa.
 * The Core of All Digital Darkness, a being who represents the negative side of the Digital World. It made Nowell the High Priest and gave Piemon/Apocalymon the means of resurrecting Millenniummon. Takes the form of a gigantic black orb and a large yellow eye.

Others

 * Zhuquemon, the Southern Sovereign Beast who is convinced that the Chosen Children cannot defeat Millenniummon and sides with the Kernel to solve the problem through the Reboot.

Character development

 * The Senior Chosen Children trying to reclaim their lost memories from the time before the Sleep Mode of the Digital World and trying to see if they can remain as the Chosen Children despite maturing and changing during the last year.
 * The Junior Chosen Children, especially Will, questioning why the Chosen Children are even needed if there were ways of defeating the enemies without them, and because of the Sovereign Beasts’ civil war about whether the children are needed or not.
 * All thirteen Chosen Children learning to make their own choices, rather than being guided by anyone, and to regain the light of hope within all of humanity, to destroy Millenniummon.

Plot

 * The intro recounts all the events of Fight for Survival that led to the current moment. Right after Dyson, Ken, Tyler, Hikari, Will and Lopmon return from the Dramon Lands with Imperialdramon, Goddramon and Holydramon, and start fighting Millenniummon.


 * The major plot points of the First Act:
 * One year later, all the Chosen Children don’t remember anything from what happened while they were the Chosen Children. They only remember how a mysterious phenomenon had threatened the world one year ago. Especially the Senior Chosen Children have changed a lot: Taichi has become serious, Matt has become open and friendly, Sonya has become more feminine, Connor has become more proactive and social, Mimi has become more confident, and Joe has become resourceful and balanced. But the Junior Chosen Children feel that something is still wrong, since they are seeing mysterious nightmares. Due to this, they are all constantly meeting up with a therapist and life-coach named Julius Oatway.
 * An urban legend is told that mysterious flames and lights appear in certain parts of the city but suddenly disappear. The Junior Chosen Children keep investigating it because after everything the world has went through and convinced by their nightmares, they are ready to believe anything. They find three flaming creatures who look like they are trying to show something. Purple dimensional cracks opened by Millenniummon reappear around the world, along with several spirit-like creatures resembling MoonMillenniummon. The memories of all mankind are immediately restored. They remember the existence of the Digimon once again and start panicking. They also start blaming the Chosen Children for these latest events.
 * When the law enforcement starts to chase the Chosen Children, the Juniors regroup with the Seniors, and the flaming creatures open three portals to forcefully send them back into the Digital World. The grown-up law enforcers and government officials are unable to follow them. The first portal takes Tyler, Hikari, Dyson, and Ken. The second portal takes Taichi, Connor, Mimi, and Milena. And the third portal takes Matt, Sonya, Joe, and Evan.
 * When the Children arrive to the Digital World, they see an apocalyptic environment with similar dimensional cracks as in the real world. But the entire place looks like frozen in time and the dimensional cracks can take anyone to either different part of the Digital World or back to the real world. Things soon change when some of the environment starts to move again. The groups are jumping through cracks into different parts of the Digital World.
 * Agent Murdock and his task force are regrouped by their returned memories. Oatway offers to join the task force as its newest member, because he has spent years of trying to find a way to achieve a way for the grown-ups or non-Chosen children to enter that world. His career as a therapist for young people was part of a research to find out why the Chosen Children were so special. The other members of the task force allow him to join, but Murdock has an uneasy feeling about it.
 * Dyson, Ken, Tyler, and Hikari arrive at a shrine, where a mysterious blue light also brings Will Dunham (whose own memories were recently restored) and Lopmon. They explain that the place is one of the shrines where the Digimon regularly visit to communicate with the Sovereign Beasts who have been the current rulers of the Digital World since Apocalymon’s defeat. A hologram of the Eastern Sovereign Beast, Qinglongmon, appears before the five children and into the locations of the other two groups. The Junior Chosen Children’s memories are restored, with Dyson, Ken, Tyler and Hikari recognizing Qinglongmon as the one who saved them from Nowell Sharpe and Piemon, and gave their partners the ability to mega evolve into Imperialdramon, Goddramon and Holydramon (without directly mentioning the events of Dramon’s Roar).
 * Qinglongmon shows visions and starts to explain what has happened. Ever since the Moon of the Digital World was destroyed as part of Millenniummon’s resurrection, an apocalypse started in the Digital World, and the dimensional cracks only made things worse. The battle between the Chosen Children and Millenniummon was interrupted because happened that forced the Digital World put into Sleep Mode (darkening and immobilizing it for the time being), with only the Sovereign Beasts being allowed to remain active.
 * But Millenniummon’s powers could not be contained in Sleep Mode for longer than one year. And since the time has nearly passed, the Digital World is slowly starting to become active again. Qinglongmon tells the Chosen Children find what they need to defeat Millenniummon and disappears.
 * After that, the evil spirit creatures (which Qinglongmon referred as Millenniummon’s Extensions) reappear in the locations of the Chosen Children and start transforming into other kinds of Digimon. Everything the Extension Digimon touch turns into crystal. The Senior Chosen Children who still do not remember anything, are confused, and do not know what to do. The Juniors encourage them to try to remember their past, thinking that it is what they needed to reclaim.
 * Although struggling at first, the Digivices reappear on their hands, and Agumon, Gabumon, Piyomon, Tentomon, Palmon and Gomamon appear before them. The six reappeared Partner Digimon evolve into Champion forms and then into Ultimate forms to fight the Extension Digimon. But the Partner Digimon are only able to maintain their Ultimate forms for a short while, due to the Senior Chosen Children not accustomed to their returned memories just yet.
 * Lopmon also evolves into Tueryemon and fights the Extension Digimon. But the shrine starts to collapse, and Will and Lopmon are separated from others while trying to escape. The same flaming creatures that brought the Chosen Children into the Digital World take Dyson, Ken, Tyler and Hikari to safety. But the children wonder why Veemon, Wormmon, Hawkmon, Armadimon, Patamon and Tailmon have not reappeared. And Connor is unable to locate or even contact Huckmon, Spadamon or any other ally Digimon.
 * Oatway introduces Murdock to the other child patients who express their desire to be just like the Chosen Children but better. Oatway and his assistant are trying to artificially gift them a potential to be a Chosen Child by examining Millenniummon’s energy and trying to develop a safe non-distorting way to change people’s potential and the Digital World. But after Oatway has left, the children openly reveal that they consider other people ”trash”, just like the Digimon Emperor used to. Oatway and his assistant have an evil smile while Oatway also seems to be affected by some dark energy. Murdock, who secretly remained in the facility, witnesses this.


 * The major plot points of the Second Act:
 * Taichi’s group reaches a city under a dome filled with many Machine-type Digimon and replications of many familiar landmarks from the real world. The residents seem still immobilized but one Digimon, Andromon, is still walking. He is first assumed to be an enemy because Connor analyzes a fragment of Millenniummon’s energy within him. Andromon admits that he was forced into the Disciples of Apocalymon against his will. Even his part of his own data was taken from him to resurrect Mugendramon.
 * Matt’s group finds its way to the Village of the Beginnings where Elecmon and Spadamon’s resistance group were immobilized because of the Sleep Mode. The village looks ruined and most of the Digi-Eggs have either turned lifeless or been destroyed.
 * The weakened Qinglongmon is met by another Sovereign Beast: Zhuquemon. Zhuquemon is angry at Qinglongmon and Huckmon for bringing the Chosen Children back. Qinglongmon states that the Digital World needs the children, but Zhuquemon blames the children for failing to stop Millenniummon’s resurrection and for being a danger for the contingency plan to defeat Millenniummon without the children’s help is the only option. Zhuquemon is also revealed to have saved Will and Lopmon from the collapse of the shrine, so he could prevent them from the interfering.
 * Zhuquemon directly contacts the task force by using Huckmon’s old communication routes. He declares the Chosen Children failures and reveals a contingency plan from the Kernel itself to defeat Millenniummon, the Reboot. The Reboot would return the Digital World and majority of the Digimon back to the state where it was before Deathmon even created Millenniummon. It would also restore all the Digimon who died outside of the Digital World back to life, including Leomon and Wizardmon. Murdock openly disagrees with this plan and tries to reveal the truth about Oatway to the other member of the task force. But the task force believes that Murdock has become too attached to the Chosen Children and accepts the Kernel’s plan. Murdock runs away and becomes a fugitive in the process, while Qinglongmon frees Will and Lopmon.
 * Dyson, Ken, Tyler, and Hikari find themselves from the Holy Ruins where Will and Lopmon are brought by Qinglongmon. They contacted by Connor who uses the main terminal of the Dome City activated by Andromon. Will angrily reveals the truth about the upcoming Reboot and claims that the Chosen Children were never needed to save the Digital World. Lopmon is also disappointed by the Kernel’s decision, but still refuses to believe that the children were unneeded, leading to an argument with Will. Tyler and Hikari are also conflicted because the Reboot could restore their deceased allies and allow them a happy life.
 * The flaming creatures (who are revealed to be called At, Rene and Pol) transform into an apparition of a knight-like Digimon with similar elements than Huckmon. He is revealed to be a Digimon named Jesmon. The Chosen Children experience a flashback:
 * Omegamon, Imperialdramon, Goddramon and Holydramon managed to release the other Chosen Children and Partner Digimon from the Time Unlimited. But after fighting for a while, Omegamon started to separate back into Agumon and Gabumon soon after Dyson, Ken, Tyler, Hikari, Will, Imperialdramon, Goddramon and Holydramon had returned to the Digital World with Qinglongmon’s help. Three Dragon Digimon had tried to fight against Millenniummon but were outmatched. Huckmon had suddenly appeared, and warp evolved into Jesmon who started to launching sequence of the Sleep Mode and told the Chosen Children to return to the real world.
 * The former leaders of the Disciples of Apocalymon, Nowell Sharpe and Dracmon (after mega warp evolving into Piemon once more), had tried to stop them. But they failed and are struck by Millenniummon’s own attack against the children instead. After the Digital World finally went into Sleep Mode, the mankind slowly started to lose its memory about the Digital World and the Chosen Children was forgotten, remembering only the destruction caused by the invasions to the real world.
 * Jesmon also convinced the Kernel to authorize the Sleep Mode plan before going through the Reboot plan. But he says that the amnesia was not his doing. Someone else used it to sabotage his plans. The Junior Chosen Children ask why the Reboot was not the first option rather than last one, Jesmon reveals that the Reboot requires lots of power and cannot be used very often. It would also affect the real world in form of a temporary global blackouts, which is why the Reboot is usually the last resort.
 * After the explanation, Jesmon also reveals that Imperialdramon, Goddramon, Holydramon and Millenniummon’s physical bodies are still immobilized in the space around the Digital World. He also reveals that he will die when the Sleep Mode ends but is willing to accept it because he is the only Guardian Knight who survived the ancient war against Millenniummon and believes that he failed the children, wanting to make amends by sacrificing himself. He and Qinglongmon cannot help the children any further because of Zhuquemon and the Kernel. The children must now make their own choices if they want to find a way to defeat Millenniummon before the Reboot.
 * Will is uncertain because he is accustomed to act under guidance. He is also uncertain because he has not seen himself as a friend of the other Chosen Children, but rather a messenger who dragged other people into fighting against Millenniummon on behalf of the Sovereign Beasts and the Kernel, whom he is unable to fully trust anymore. Lopmon is the only one Will has considered as an actual friend.
 * The Extension Digimon attack again, and this time two of them take the forms of Devimon and LadyDevimon. But instead of remaining as mere Extensions, they appear and speak like the old enemies of the children. Devimon and LadyDevimon reveals that after the destruction of their bodies, their spirits had to returned to the bodies of Patamon and Tailmon. But now Millenniummon had given them physical forms again. They mock the children about letting despair and darkness to take over of the hope and light of the humanity. They also mock the Senior Chosen Children for moving into adulthood without a second thought after the amensia had taken them over, The Senior Chosen Children, however, prove that they have not completely lost what made them Chosen in the first place, and manage to evolve to their Mega forms.
 * Because Dyson’s, Ken’s, Tyler’s, and Hikari’s partners are not there to protect them, Will is forced to protect his fellow Chosen Children by himself. While Devimon and LadyDevimon ask from Will what a mere messenger can do, Will answers that he has always been more than just a messenger. He is just only now fully embracing it by deciding to finally take the destiny into his own hands. This allows Tueryemon to ultimate evolve into Andiramon who defeats most of the enemies.
 * Andiramon also summons Hawkmon and Armadimon back to help the other two groups and forms a contact with Goddramon and Holydramon, destroying the Extension forms of Devimon and LadyDevimon and transforming them into the holograms of Patamon and Tailmon. Elecmon, Spadamon and the resistance group are also able to move again and join the battle. After the enemies are defeated, Patamon and Tailmon reveal that someone in the real world is trying to prematurely free Millenniummon’s physical body from the Sleep Mode. The children are then contacted by Murdock who suspects that the culprit is Oatway. But Murdock also ends up revealing his location to the task force, leading to his arrest.


 * The major plot points of the Third Act:
 * The children arrive at Oatway’s facility, where Oatway reveals all the data he has gathered about the Chosen Children, and how Ken’s data was the one that helped him most, due to Ken’s past as the Digimon Emperor. He used this data gift his other patients, referred by Oatway as the ”True Chosen Children”, with their own Digivices and Partner Digimon. Oatway reveals that he is an old friend of all the Junior Chosen Children’s parents and how he had been aware of the existence of the Digital World ever since he was a child. After finding out that his friends’ children were chosen, Oatway wanted to enter the Digital World too but was unable to enter any portals due to being an adult and not having a Digivice. He was also convinced that he could not only save the Digital World by using Millenniummon’s on power against itself, but also transform it into a place which could be visited even by the adults or children without Digivices.
 * Ken believes that Oatway and the ”Influenced Children” are either delusional or being manipulated. Oatway is outrageous and refuses to believe this. But then, the Partner Digimon assigned for those children are turned into the Extension Digimon. The dimensional distortions also worsen and Millenniummon’s real body can move again in the space around the Digital World. Then, a mysterious worldwide broadcast starts showing in television. The broadcast shows Oatway saying that he was secretly working for Millenniummon this whole time, and that there is no hope for humanity or the Digimon at all. He even claims that even the Chosen Children or the Reboot would be unable to save them.
 * The Oatway in the facility denies making such a broadcast, but then his facial expression becomes empty and he says ”Not by your choice, Julius Oatway. But people believe what they want to see. And just like you, they are easy to manipulate. And their light of hope is easy to be lost.” The last words are simultaneously spoken by the assistant who reveals himself to be Nowell Sharpe, who then transforms into a being who looks like a fusion of Nowell and Piemon.
 * Nowell-Piemon releases Oatway from his own Influence, and restores the last missing memory of all mankind (the one about his own face), revealing himself to be responsible for the global amnesia and the one who tried to help Millenniummon to be released from the Sleep Mode. He reveals that Millenniummon’s attack fused Nowell and Piemon together and gave them the ability to protect themselves from the Sleep Mode of the Digital World. He then escapes with the Influenced Children to the Digital World.
 * The Chosen Children, accompanied by Andromon and Spadamon’s resistance group, follow their enemies to the space around the Digital World. Ken and Evan also take the weakened Oatway with them. Imperialdramon, Goddramon and Holydramon are still unable to move for some reason. But when Millenniummon is about to launch an attack that would kill the three Dragon Digimon, Jesmon appears between and sacrifices himself. Just before he dissipates, he expresses his faith that the children will manage to stop Millenniummon one last time. Nowell-Piemon laughs and mocks Jesmon for being in a hurry to die. That is when Imperialdramon, Goddramon and Holydramon start moving again.
 * Taichi and Matt try to ultimate fuse WarGreymon and MetalGarurumon into Omegamon once again but fail. They realize from Devimon’s and LadyDevimon’s words that it was the ”light of hope” sent by humans around the world who had faith in the Chosen Children that allowed Omegamon’s ultimate fusion in the first place. The Chosen Children’s failure to stop Millenniummon’s resurrection a year ago had weakened the light of hope and Nowell-Piemon’s manipulations had prevented the humans from regaining it.
 * While the Partner Digimon remain in the space fighting Millenniummon, the children find a way to enter the manifestation of Millenniummon’s core, resembling a giant crystal chamber. Oatway confronts Nowell-Piemon, trying to talk to him. One year ago, when Nowell was Oatway’s genuine assistant under the fake alias. Oatway had found out about his real identity, but instead of turning Nowell in, he wanted to help him to overcome misanthropy. But Nowell had ran away and used the knowledge stolen from Oatway to erase all data of his real identity and to execute all his plans used to manipulate Ken and Oatway, to resurrect Millenniummon, and to stop the Chosen Children from interfering.
 * Nowell-Piemon mercilessly stabs Oatway with one of his Trump Swords. The Chosen Children are so angry at Nowell, accusing him of being a miserable man who is making others miserable simply because his own life was miserable. Then, Piemon’s voice alone starts speaking from Nowell-Piemon’s mouth and reveals that this is why he chose Nowell is his partner. He also reveals that Piemon ”was only a vessel”. Piemon’s and Nowell’s fused body starts to rapdily rot. Piemon reveals that he is, in fact, Apocalymon himself, and how small amount of his own data took over the Piemon, who was left to die by the previous Chosen Children, to be a new vessel.
 * Apocalymon himself was born from multiple of Digimon who did not survive Millenniummon’s original defeat and lost their ability to be reborn from Digi-Eggs. Before their deaths, the spirits of the dying Digimon had cursed the Digital World and the Kernel for failing to protect them, and the Core of All Digital Darkness turned their data into a being whose very desire for revenge for their unfair past life would be a catalyst of the end of the Digital World. Apocalymon first tried to achieve this by using its own distorting and evolution reversal powers. But after he failed and barely survived inside Piemon, the Core of All Digital Darkness partnered him with Nowell (who had the similar desire for revenge against the real world), and gave them means of resurrecting Millenniummon. Apocalymon considered it only fair that Millenniummon would take every Digimon’s happiness away. The task of resurrecting Millenniummon was originally given to Vamdemon, but he betrayed both Millenniummon and the Core by seeking to conquer the worlds for himself.
 * While the Kernel would have power to return the Digital World into the state before Millenniummon’s birth, Apocalymon’s years of darkness had made vengeance consume him and to see the end of the two worlds as his only hope for revenge against everyone. However, Millenniummon tortures him with the Black Lightnings and starts speaking with the same voice Ken heard two years ago. Millenniummon reveals it has no interest in Apocalymon’s plans or those of the Core of All Digital Darkness. All Millenniummon cares about is being a bringer of chaos and destruction. It is all he wants to be and ”should” be, due to being a chaotic and violent mix of data from other Digimon species. Even after developing an intelligent mind after his first defeat in the ancient war, he only used his newly developed intelligence to further his desire to be reborn and destroy everything, including letting VenomVamdemon to be destroyed by the Chosen Children five years ago, after realizing that the traitorous Dark Digimon would fail to resurrect him.
 * Apocalymon also reveals that it was Deathmon’s plan all along for Millenniummon to overpower his creator and threaten the interdimensional stability. He does not mind because he just wants to be a witness Millenniummon destroying everything and to be last one to be destroyed. But annoyed Millenniummon tortures Apocalymon more and tells him to destroy the Chosen Children if he does not want to be the first one to be destroyed.
 * Apocalymon is not as powerful as he once was but manages to drain the dark energy from the Influenced Children to conjure weapons that are based on DanDevimon’s, VenomVamdemon’s, MetalSeadramon’s, Mugendramon’s and Diablomon’s attacks and uses them against the Chosen Children. Hououmon, HerakleKabuterimon, Rosemon, Vikemon, Sigurdmon, Shakoukimon and Andiramon appear in the chamber to fight Apocalymon, while WarGreymon, MetalGarurumon, Imperialdramon, Goddramon and Holydramon keep fighting against Millenniummon. The Apocalymon manages to use his evolution revesal power to force the Partner Digimon back into their Rookie forms. Apocalymon also tries to slowly destroy all the Digivices.
 * The wounded Oatway is conflicted about finally being in the Digital World, blaming himself for falling into Nowell-Piemon’s trap. But Ken opens about his past feelings about Samuel’s death and his time as the Digimon Emperor and reveals how Oatway himself had helped him to finally forgive himself. He and the other Chosen Children agree that while Oatway was a victim of manipulation, he helped them find out what they want to do after graduating from high school and becoming adults. The Chosen Children also manage to convince the Influenced Children to snap out of their despair and take control of their own lives.
 * Millenniummon tries to create new Extension Digimon to attack the formerly Influenced Children, but the children gain real Digivices and real Partner Digimon to defend them (Digivices are like that of Ryo Akiyama’s at the end of Dramon’s Roar and they have no Crests of their own). People around the world see the footage of this and hear the Chosen Children’s speech through their computers and televisions. This restores the light of hope, which, and together with the power of the Crests, it prevents the destruction of the Chosen Children’s Digivices and warp evolves all the Partner Digimon back into their Ultimate and Mega forms.
 * The light of hope also ultimate fuses WarGreymon and MetalGarurumon into Omegamon once again and grants Imperialdramon an ability to switch into the Knight Mode. Andiramon recognizes Imperialdramon Knight Mode as the second Guardian Knight who helped Omegamon to defeat Millenniummon in the ancient war. Millenniummon also tries to use the distortions to transport every attacking opponent into a location where either he or Apocalymon could launch a counterattack, but the Partner Digimon manage to fight back despite it. Qinglongmon joins the battle and even Zhuquemon is moved enough to join the battle. The two Sovereign Beasts hold Millenniummon and give Goddramon, Holydramon, Imperialdramon and Omegamon a chance to destroy him. Meanwhile, the other Partner Digimon manage to destroy Apocalymon’s tentacles. And the light of the Digivices forcefully separates Nowell from Apocalymon’s body.
 * Instead of being angry about their defeat, the spirits that formed Apocalymon’s collective mind are laughing. The Crystal Chamber Core of Millenniummon shatters and resurrects Millenniummon in a more powerful form: ZedMillenniummon, a large Digimon which looks like the spirits of Mugendramon and Chimairamon bonded together. Qinglongmon and Zhuquemon reveal that the reason why the Kernel originally wanted to proceed with the Reboot was to defeat Millenniummon before it could ZedMillenniummon, which would be powerful enough to even stop the Reboot from occuring.
 * ZedMillenniummon’s mere presence is a distortion which allows its attacks to simutaneously cause damage to the real world and the Digital World, destroying a couple of cities and killing a significant number of humans and Digimon. The Chosen Children, the former Influenced Children, and all the Digimon with even small amount of light inside refuse to let ZedMillenniummon win, and their inner light of hope allows Goddramon and Holydramon to fuse themselves and the other nine Partner Digimon with Omegamon and Imperialdramon into Omegamon Heavenly Mode and Imperialdramon Heavenly Mode.
 * The two powerful Digimon block easily destroy Apocalymon’s angry spirits, and they block every single one of ZedMillenniummon’s attacks until they are ready to force their enemy to separate into two separate beings by using Fearsome Blade and Supreme Sword respectively. Omegamon Heavenly Mode’s Graceful Cannon obliterates Mugendramon’s spirit half by using both and Imperialdramon Heavenly Mode’s Bright Death obliterates Chimairamon’s spirit half. The countdown to Reboot disappears completely, since the children succeeded in destroying Millenniummon. Omegamon and Imperialdramon also destroy Apocalymon’s angry spirits.
 * The Core of All Digital Darkness itself teleports before the Chosen Children, Omegamon and Imperialdramon, opening its large yellow eye, and forcibly teleporting its enemies back to the real world. When the children find themselves in the real world, the yellow eye of the Core appears in a black background in Connor’s tablet computer. DigiLetters also appear on the screen with a strange sound effect (the voice of the Core) being heard of the background. The letters read as ”Apocalymon...ZedMillenniummon...Those deaths shall become the catalyst! To open the path to bring forth the true Multiversal Catastrophe! We shall meet again, Chosen Children, on the day when everything is supposed to end!” After that, the Core teleports somewhere else and Connor’s tablet computer returns to its normal state.
 * The Sovereign Beasts, including Xuanwumon and Baihumon, contact the Chosen Children and take the body of the dying Oatway back into the Digital World to transform into a spirit who would replace Jesmon as the new messenger. The Sovereign Beasts also demand to be allowed to punish Nowell for the crimes against the Digital World. The exhausted Nowell refuses to let go of his negativity, promising to keep dedicating his life to destroy the Chosen Children, their partners, and the rest of the mankind or the Digimon.
 * Oatway still feels pity for Nowell and asks him to be spared. The Sovereign Beasts agree, and ask help from Patamon, Tailmon and Lopmon to enforce Nowell’s sentence. Nowell is sentenced to be transformed into an intangible being and to be trapped into a paradise-looking pocket dimension where nothing bad ever happens and where Nowell cannot enjoy or damage anything. He would also be unable to age or even die. Only if Nowell would ever genuinely feel genuine remorse for his actions, he would regain his freedom and mortality.
 * The Kernel combines the modified and partial version of the Reboot’s restoration powers with the remaining amount of light of hope to restore the Moon of the Digital World and allow the data of the deceased Digimon, including Apocalymon’s spirits to be returned to the Digital World to be reformatted into Digi-Eggs. Spadamon begins raising the reincarnation of Leomon (in his Baby form) while Wizardmon’s and Jesmon’s Digi-Eggs remain with Elecmon. The Kernel and the Sovereign Beasts announce that they would soon enter a deep sleep to regain some of their lost powers, but not before declaring the formerly Influenced Children as the first ”Tamers”.
 * Everyone also talks about how the Core of All Digital Darkness can easily teleport itself to any place, so straight attack would be impossible. The only choice is to wait until the Core would finally make its move to start the true Multiversal Catastrophe it spoke about. Patamon and Tailmon hear Devimon’s and LadyDevimon’s voices who tell the two Holy Digimon that they will be ”excited” to see if light and hope will triumph once again over darkness and despair when the Multiversal Catastrophe approaches.
 * Since some of the members of the Chosen Children are about to reach adulthood, they now start themselves as the Chosen Ones instead. While they are certain they will never lose their powers or be separated from their partners ever again, Zhuquemon and Qinglongmon (before entering their sleep) know something about the Chosen Ones’ fate that they decide not to reveal yet.
 * Until time for the next battle comes, the Chosen Ones decide to return to rebuilding the two worlds and try to better the relations between them. Murdock resolves to help them as an independent consultant. He also reveals that he has managed to find the previous Chosen Ones who defeated Apocalymon’s original form.


 * The mid-credit scene:
 * Inside the black orb, a tentacled being is holding a crystal that constantly changes its form and radiation between darker shades of rainbow colors very violently. The being speaks through its sound effects, with both the DigiLetters and Latin alphabet translating it is: ”Let it be heard again! The true voice of darkness! To call upon the arrival of the Multiversal Catastrophe! My arrival!” That is when the being opens its yellow eye again.

Removed story

 * The time-skip being three years long instead of one year.
 * Wizardmon’s ghost helping the Chosen Children to return to their mission instead of At, Renel and Pol.
 * Agumon and Gabumon learning to mega evolve into their alternate Mega forms: BlitzGreymon and CresGarurumon, and Omegamon learning to slide evolve into Omegamon Alter-S.

Removed characters

 * Meiko Mochizuki, a transfer student from Japan.
 * Meicoomon, Meiko’s partner who becomes an important tool for the Cult of Dark Digital Cosmos (the originally planned incarnation of the Disciples of Apocalymon).
 * Daigo Nishijima, a Japanese member of the international task force of the United Nations.
 * Professor Mochizuki, Meiko’s who becomes a member of the international task force of the United Nations, alongside Nishijima and Agent Murdock.
 * Pinocchimon, a surviving Disciple of Apocalymon who helped Nowell-Piemon to manipulate Oatway.

Development
When CAJH was trying to figure out how deal with Millenniummon’s resurrection in Fight for Survival in the previous films, he initially considered Ultimate Holy Battle as the title because of the 50th episode of Digimon Adventure: being titled ”The End, the Ultimate Holy Battle” and featuring a final battle against Millenniummon too. But after Ultimate Holy Battle was moved to be the title of another installment, the new title for the sixth main installment was changed into Millenniummon Descends, which is inspired by the title of the 49th episode of Digimon Adventure: (”The God of Evil Descends, Millenniumon”).

Trivia

 * The title Millenniummon Descends is inspired by the 49th episode of 2020 Digimon Adventure: (”The God of Evil Descends, Millenniumon”.
 * In this film, Will Dunham had more significant role and character development due to some of it needed as a way help him learn how to make Lopmon super evolve to Andiramon.
 * Omegamon’s and Imperialdramon’s Heavenly Modes are greatly influenced by Omegamon Merciful Mode and Imperialdramon Paladin Mode.
 * Unlike in the real-life media, this version of ZedMillenniummon does not the green binds around his body.
 * The Extension Digimon are partially based on the Digimon created from the Dark Towers by Arukenimon in Digimon Adventure 02 but also by how Gryphomon was created from a fragment of Kimeramon in 2020 Digimon Adventure:.
 * Millenniummon was also originally intended to be one of the multiple Dark Digimon fighting the Chosen Children in the same film, but only Apocalymon was kept as the secondary villain while Millenniummon was always meant to be the main villain of the film. The other Dark Digimon were saved for later films.
 * Nowell-Piemon is partially inspired by the Ultimate Drago from the third season of 2003 Teenage Mutant Ninja Turtles, but with Piemon (Apocalymon in disguise) later taking over as the host of the body.
 * Apocalymon does not have the giant polyhedron as his real body due to plans of introducing it in potential prequels.
 * The film reveals that VenomVamdemon losing against the Chosen Children was part of Millenniummon’s plan all along.
 * ZedMillenniummon being destroyed by Omegamon Heavenly Mode and Imperialdramon Heavenly Mode is inpsired by Ordinemon being destroyed by Omegamon Merciful Mode in Digimon Adventure tri.
 * The scene of ZedMillenniummon split in two with Omegamon destroying the Mugendramon half and Imperialdramon destroying the Chimairamon half is inspired by Mugendramon being the opponent of the first eight Chosen Children in 1999 Digimon Adventure and Kimeramon being the opponent of the new Chosen Children in Digimon Adventure 02.
 * Nowell’s defeat is inspired by Ch’rell’s exile in the third season of 2003 Teenage Mutant Ninja Turtles as well as Vassago Casals’ defeat and Gabriel Miller’s death in Sword Art Online: Alicization.
 * There were initially conflicts during the drafting process about whether to restore Leomon and Wizardmon back to life. CAJH did agree to restore them in a way that they would not have the memories of their past lives, since they were no Partner Digimon. One of the reasons for this plot point was to complete the circle of Spadamon’s journey. Another one was to allow Leomon’s and Wizardmon’s evolved forms to be potentially introduced in the future.
 * Negamon’s real appearance and a tease for him facing the Chosen Children was inspired by the mid-credit scene of Avengers: Age of Ultron to set up Avengers: Infinity War. But the colorful transforming crystal teases that Negamon will not work completely alone but instead has some other Dark Digimon to replace Millenniummon.