Negamon (Adventure:)

Negamon is the main antagonist of the series Digimon Adventure:.

Fiction
Negamon shelters inside a dark orb within the Network. Its original purpose was to generate disasters in order to stimulate the Digital World's evolution, such as the ancient war between the Dark and Holy Digimon.

In August 2020, Negamon initiates its plans for a new disaster by dropping a large amount of s into the Network, which hatch into a swarm of Fresh and digivolve all the way to Champion. After destroys the Mega Argomon and redirects the controlled nuclear missile from hitting Tokyo, Negamon drops another Digi-Egg into the Network, this one hatching into. It observes as Omnimon later destroys Eyesmon's Mega form,, and continues the countdown that stopped after Nidhoggmon's death. Negamon then opens a portal which scatters the and their partner Digimon.

Shortly after 's death, Negamon senses the DigiDestined's Crests reacting in the Giant Tree of Information. It sends a swarm of to brainwash Burpmon into consuming the data regarding the Great Catastrophe, but the DigiDestined destroy Burpmon and set to reconstructing the data. Negamon later sends a group of Argomon to test Tai and 's bond. After destroys the other Argomon, the Ultimate Argomon warns them that its master would soon begin the Great Catastrophe, then returns to Negamon.

After the DigiDestined have discovered the full powers of their Crests, Negamon dispatches a legion of Soundbirdmon to attack the Giant Tree of Information and other targets, heralding the Great Catastrophe. Although the DigiDestined defeat the Soundbirdmon swarm, Negamon is freed from the orb and begins to consume and nullify both the Network and the Digital World. It eventually ingests the DigiDestined as well, but they avoid deletion by means of their Digivices and are confronted by the Ultimate Argomon. To their horror, Argomon reveals that the human negativity within the Network data stolen by Negamon's minions had corrupted it and transformed it into an omniversal devourer. Argomon digivolves and stalls the DigiDestined alongside its brethren, and although the Argomon are defeated, Negamon's awakening has completed. After breaking the barrier between the Digital and real worlds, Negamon digivolves into a larger Negamon.

Negamon's Digi-Egg
After being destroyed by, Abbadomon reformats into a Digi-Egg which then vanishes in a streak of white light.

Negamon (Giant)
Negamon (Giant) is the digivolved form of Negamon.

After the destroy the, Negamon breaks the barrier between the real world and the Digital World, and digivolves into Giant Negamon. After, , and  sever the tentacles threatening both worlds, the Giant Negamon starts to emerge from its orb. that is when and  attack and seemingly destroy Giant Negamon's body. But realizes that that they only destroyed Giant Negamon's shell. The Giant Negamon then fuses with the black orb surrounding it, becoming both and.

During the battle between and Abbadomon Core, Abbadomon Core summons a Giant Negamon and fires it at Omnimon, who blocks it with its shield. Omnimon destroys Giant Negamon, though this was just a distraction so Abbadomon Core could shoot a laser at Omnimon in an attempt to kill him. This fails, however, and the battle continues.

In the Digivice: virtual pet, the Giant Negamon is defeated by the DigiDestined's Partner Digimon.

Abbadomon
Abbadomon is the fused form of the Giant Negamon and the black orb. The Giant Negamon also simultaneously digivolved into, splitting into two separate Digimon.

After the Giant Negamon's shell body is destroyed by and, the Giant Negamon fuses with the black orb to become both Abbadomon and Abbadomon Core. Abbadomon's tentacles attack, , , , , , and , destroying their physical forms and forcing the four Mega Digimon to revert to their Rookie forms. WarGreymon, MetalGarurumon, Seraphimon and Ophanimon continue their fight against Abbadomon, but Abbadomon nearly destroys, WarGreymon, and MetalGarurumon. Then, people across the real world send their hope of light into the void, restoring the physical forms of the DigiDestined and digivolving their partners back to their Mega forms. They send the energy to, , and , who are rescued from Abbadomon's tentacles by the shades of  and , and send it forward to WarGreymon and MetalGarurumon, allowing them to DNA digivolve into. Omnimon breaks into Abbadomon and flies into the heart of it, ready to end the Great Catastrophe once and for all.

As Omnimon battles Abbadomon Core, it causes the movements of Abbadomon itself to lag. Izzy realizes that all of the evil Digimon's resources being used on the battle inside of the orb and, in the hopes of slowing the inner movements as well, Rosemon, Vikemon, HerculesKabuterimon, Phoenixmon, Seraphimon and Ophanimon continue to battle Abbadomon. Although they are able to destroy several of Abbadomon's tentacles, the Mega Digimon fail to cause any real harm to it. However, the DigiDestined's determination allows Omnimon to Mode Change into who proves to be more than a match for Abbadomon Core, eventually destroying it before Alter-S Mode Changes back into Omnimon. In Abbadomon's white void, Abbadomon shrinks and reformats into a Digi-Egg that vanishes in a streak of white light while Omnimon destroys Abbadomon's area in the Network.

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

Abbadomon Core
Abbadomon Core is the true form of Negamon existing within the orb body of Abbadomon. The Giant Negamon simultaneously digivolved into both Abbadomon and Abbadomon Core, splitting into two separate Digimon.

After the Giant Negamon's shell body is destroyed by and, the Giant Negamon fuses with the black orb to become both Abbadomon and Abbadomon Core. During the battle between Abbadomon and the DigiDestined, people across the real world send their hope of light into the void, restoring the physical forms of the DigiDestined and digivolving their partners back to their Mega forms. They send the energy to, , and , who are rescued from Abbadomon's tentacles by the shades of  and , and send it forward to WarGreymon and MetalGarurumon, allowing them to DNA digivolve into. Omnimon breaks into Abbadomon and flies into the heart of it, ready to end the Great Catastrophe once and for all.

In the heart of Abbadomon's orb, Omnimon locates Abbadomon Core and engages it in battle. The battle between Omnimon and Abbadomon Core causes Abbadomon to lag from all of the evil Digimon's resources being used on the battle inside of the orb so the DigiDestined resume attacking Abbadomon, hoping that it will slow Abbadomon Core's movements as well. Abbadomon Core eventually overpowers Omnimon, but the DigiDestined's determination allows him to Mode Change into who proves to be more than a match for Abbadomon Core, eventually slicing it in half. The top half turns into a giant purple cloud with a giant fanged mouth that swallows Alter-S, but he blows this form up from the inside and Mode Changes back into Omnimon. In Abbadomon's white void, Abbadomon shrinks and reformats into a Digi-Egg that vanishes in a streak of white light while Omnimon destroys Abbadomon's area in the Network.