Moon=Millenniummon (Adventure:)

Moon=Millenniummon is an antagonist from the series Digimon Adventure:. It was the weapon of the Dark Digimon.

Story
Before the DigiDestined arrived in the Digital World, ZeedMillenniummon was a pure destructive force that was responsible for the deaths of countless Digimon during the ancient war between good and evil Digimon. It served as a weapon for the Dark Digimon Army. However, they were unable to control its power, forcing, , , , , , , and to sacrifice themselves in order to defeat it. After Phoenixmon, Rosemon, Vikemon and HerculesKabuterimon were destroyed, Seraphimon and Ophanimon helped WarGreymon and MetalGarurumon DNA Digivolve into who was empowered by all of the souls of the fallen Digimon. Omnimon was able to destroy ZeedMillennimmon with one strike from his sword.

ZeedMillenniummon's body was shattered into several dark crystals that spread across the Eternal Continent and the Cloud Continent. The smallest crystal also contained its soul, Moon=Millenniummon, which was used by and  for digivolution. The largest dark crystal, FAGA, was located in the Sealed Grounds and guarded by several, who were Millenniummon's worshippers. Because of the dark crystals, the black lightning began to strike the Eternal Continent, sending data stolen from the Internet to the dark crystals, which direct it forward to FAGA, so it can be used for creation of a new body for Millenniummon.

Devimon first used Moon=Millenniummon against the DigiDestined, when he made SkullKnightmon digivolve into. When facing the DigiDestined himself, Devimon also combines Moon=Millenniummon's power with the data sent by Calmaramon to digivolve himself into. And after NeoDevimon's defeat, AxeKnightmon retreieved it and used it to digivolve NeoDevimon into.

After DanDevimon's death, AxeKnightmon took the crystal with him to the Eternal Continent in attempt to sacrifice itself and kidnapped for a ritual to send their data to FAGA and restore Millenniummon's body. During the ritual, AxeKnightmon broke the crystal containing Moon=Millenniummon who attacked Kari as she reached 's soul. and broke in, stopped Moon=Millennimmon's attack, destroyed AxeKnightmon, and saved Kari and Gatomon, forcing Moon=Millenniummon to escape to FAGA. Moon=Millenniummon remained in FAGA until the crystal fused with, restoring Millenniummon to a new body.

ZeedMillenniummon
ZeedMillenniummon is one of Moon=Millenniummon's Mega forms.

In the past, ZeedMillenniummon was once the Dark Digimon's ultimate weapon, but they were unable to control it due to its immense power. However,, , , , , , , and defeated it by sacrificing themselves. After Phoenixmon, Rosemon, Vikemon and HerculesKabuterimon were destroyed, Seraphimon and Ophanimon made WarGreymon and MetalGarurumon DNA Digivolve into who was empowered by all of the souls of the fallen Digimon. Omnimon then destroyed ZeedMillennimmon with one strike from his sword.

After was killed by  and  it digivolved to ZeedMillenniummon, though this time it was wrapped in bands of DigiCode. ZeedMillenniummon begins destroying the Digital World, but is attacked by WarGreymon with a Terra Force powered by the hopes of all of the friends that the DigiDestined made throughout their journey. After Goldramon and Magnadramon add their power, the empowered Terra Force is able to destroy ZeedMillenniummon once and for all.

Tai is later shown a vision of ZeedMillennimmon's original destruction by Valkyrimon in order to demonstrate to him that Omnimon is the great power that can potentially stop the Great Catastrophe and what it would take to summon him again.

Millenniummon
Millenniummon is the DNA digivolved form of Moon=Millenniummon and.

Millenniummon was released from FAGA after Kimeramon was absorbed inside and transformed into a white mass that filled the giant dark crystal. After being released, Millenniummon used its powers trap the DigiDestined inside a black orb of energy in its mouth. Millenniummon tries to crush the orb with its jaw to compress the data of the DigiDestined and consume it, but was stopped by and  who released the orb from Millenniummon's mouth. After the other DigiDestined were released, Millenniummon fought against and. Goldramon and Magnadramon combined their Fatal Flame and Fire Tornado to melt down Millenniummon's cannons and then used God Fist and Dragon Fire to kill Millenniummon. But then Millenniummon digivolved into ZeedMillenniummon and started to cause massive destructon in the Digital World.

In the Digivice: virtual pet, Millenniummon is defeated by the 's Partner Digimon.