Negamon (Adventure:)

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

Story
Negamon is hiding inside a large back orb in the Network and originally used to exist to bring disasters to make the Digital World evolve from accumulating and learning. The ancient war where led the Army of Darkness to attack the Army of Light was one such disaster.

In August 2020, Negamon starts its plans for a new disaster by dropping a large amount of s into the Network, which hatch into a swarm of Fresh Level and digivolve all the way to the Champion Level. After destroys the Mega Level Argomon and redirects the controlled nuclear missile from hitting Tokyo, the Negamon drops another Digi-Egg into the Network, this one hatching into. Negamon's intention to is to power his newest disaster using the data flowing through the Network which contains a great deal of the fear and chaos from within the hearts of humans.

It watches as Omnimon later destroys Eyesmon's Mega form,, and continues the countdown that stopped after Nidhoggmon's death. Negamon then opens a portal which sucks in the and their partner Digimon, with the exception of,  and Omnimon.

Shortly after 's death, Negamon senses the DigiDestined's Crests reacting in the Giant Tree of Information. It sends a swarm of into the  to brainwash Burpmon to eat all the data regarding the Great Catastrophe to prevent to the DigiDestined from learning about it. However, the DigiDestined manage to destroy Burpmon and although the data is scattered, Izzy and Garbagemon set to work on recovering it.

Negamon later sends a group of Argomon to test Tai and in a experiment to test the power of the bond between a DigiDestined and a Partner Digimon. After destroys the other Argomon, the Ultimate Level Argomon states that its master would soon make its move and erase the Digital World from existence through the Great Catastrophe. The Ultimate Argomon then returns to its master in the Network.

After the DigiDestined have discovered the full powers of their Crests, Negamon sends a legion of Soundbirdmon to attack the Giant Tree of Information while the other Soundbirdmon are sent across the Digital World to show the Digimon that the Great Catastrophe is about to begin. During the battle against the DigiDestined, the Soundbirdmon attacking the Giant Tree of Information fuse into Ghoulmon. Ghoulmon is destroyed by and, and Ghoulmon's death also causes all of the other Soundbirdmon to die. But despite that, Negamon is freed from Abaddomon and starts to turn both the Network and the Digital World into a white empty void.

Negamon began sucking the Digital World into its void where all data is obliterated, eventually sucking the DigiDestined in as well. However, they are protected by their Digivices and confronted by the Ultimate Argomon who reveals Negamon's history and true purpose to them. To their horror, Argomon reveals that the data stolen from the Network by the Argomon, Nidhoggmon, and the Zurumon had contained so much inner chaos and fear from human hearts that it had overwritten Negamon's original instinct and corrupted it, making it insatiably hungry and willing to consume everything that exists only for its own satisfaction. As a result, Negamon's new intention is to destroy every existence, not just cause more disasters. Negamon will suck it all into its void where everything will be completely destroyed. The Ultimate Argomon digivolves to Mega to stop the DigiDestined from reaching Negamon, joined by a swarm of Champion Argomon. However, the DigiDestined's partners digivolve to Champion and destroy the Champion Argomon before digivolving to Mega and destroying the Mega Argomon who warns with its last words that it's time for Negamon to consume everything. As the DigiDestined turn their attention ot Negamon, he begins to consume the real world as well.

After breaking the barrier between the Digital and real worlds, Negamon digivolves into Kuzurumon. While the DigiDestined try to destroy Kuzurumon, its real body fuses with the black orb, becoming Abaddomon.

Kuzurumon
Kuzurumon is the evolved form of Negamon.

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

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

Abaddomon
Abaddomon is the fused form of Kuzurumon and the black orb.

After Kuzurumon's shell body is destroyed by and, the core body fuses with the black orb to become Abaddomon. Abaddomon'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 Abaddomon, but Abaddomon 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 Abaddomon's tentacles by the shades of  and , and send it forward to WarGreymon and MetalGarurumon, allowing them to DNA digivolve into. Omnimon breaks into Abaddomon's orb and flies into the heart of it, ready to end the Great Catastrophe once and for all.

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