|Voice Actor||Tanaka Hideyuki (田中 秀幸)|
Omegamon is a major character in Digital Monster X-evolution.
Omegamon is a member of the Royal Knights. At first, he is strictly loyal to Yggdrasill and views its will as absolute and beyond reproach, no matter how heinous the acts that it requires are. However, he begins to experience a crisis of faith and sympathize with the idea that the Digimon who still inhabit the Digital World have a right to self-determination and to live.
When Andromon reports to the Royal Knights that a group of X-Antibody Digimon intends to speak with them, Omegamon arrives and attempts to destroy both the X-Antibody Digimon and, to the surprise of the non-X-Antibody Digimon who summoned him, them as well. War Greymon (X-Antibody) attempts to fight him off to protect the others, but Omegamon eventually retreats when Dukemon recalls him to Yggdrasill's side. When the Royal Knights hold a meeting about Project Ark, Omegamon insists that Yggdrasill's will is absolute and the Royal Knights must fulfill their duty.
While eradicating a herd of dinosaur Digimon, Omegamon encounters DORUmon and Tokomon and attempts to eliminate them as well. However, he is confused by DORUmon and Tokomon's determination to keep fighting no matter how many times Omegamon swats them aside, and Metal Garurumon (X-Antibody) and War Greymon (X-Antibody) intervene to protect the two Digimon before Omegamon can kill them. Omegamon engages the two Digimon in a prolonged battle and inflicts a mortal wound on Metal Garurumon (X-Antibody). Following Metal Garurumon (X-Antibody)'s death, DORUmon evolves into DORUgamon and attempts to fight Omegamon again, and fellow Royal Knight Dukemon intervenes and confronts Omegamon about the nature of Yggdrasill's plan for the second stage of Project Ark.
Omegamon and Dukemon duel alone in the skies above the Digital World to resolve their ideological differences. Omegamon ends the fight quickly by impaling Dukemon upon the Grey Sword. After the fight, Omegamon is left doubting his role and actions, as well as the true intentions of both Dukemon and Yggdrasill. He briefly attempts to speak with Magnamon about his feelings, but gets nothing out of the conversation, and is left with even more doubts when Magnamon captures DORUmon and reveals his true nature to him.
When he and Magnamon witness the hordes of Death-X-DORUguremon descending on the Digital World, and Magnamon indicates that this was Yggdrasill's intent for when the Royal Knights began to falter as Dukemon did, Omegamon is horrified and seeks an audience with Yggdrasill to confirm its intent, objecting to the notion that seeing Yggdrasill is impossible.
When DORUmon (now evolved into DORUguremon) enters the Royal Knights' domain, Omegamon, impressed by the knowledge that he has entered the space by the grace of Dukemon, challenges him to a duel to prove his worth and intentions. He acknowledges that at this point, both he and DORUmon have similar intentions. DORUmon makes no attempt to defend himself, but before Omegamon can finish him off, he evolves into Alphamon.
Omegamon accepts Alphamon's intent to stop Yggdrasill's plans, and allies with him. The two confront Death-X-DORUgoramon, and while Omegamon is unable to stand against it, Alphamon destroys it.
Alphamon and Omegamon enter Yggdrasill's domain to confront it in person about its intentions for Project Ark. Yggdrasill, having been warned by Magnamon that that would come, does not respond to them in any way, and they conclude that their only option is to destroy Yggdrasill to halt the collapse of the Digital World. In retaliation, Yggdrasill sends a Death-X-mon and a horde of phantom Death-X-DORUguremon after them. Alphamon (who has transformed into Alphamon: Ouryuken sacrifices himself to destroy Death-X-mon and clear the path to Yggdrasill, and passes what remains of his strength onto Omegamon, transforming him into Omegamon (X-Antibody). In this form, Omegamon pierces Yggdrasill with his All Delete and resets the Digital World.
In the reset Digital World, Omegamon and Dukemon, still in their X-Antibody forms, reflect on Yggdrasill's plans and motivations as they observe DORumon and Tokomon playing.