In the storyline of Fate of Two Worlds, it is revealed that Wesker, alongside Doctor Doom, has been assembled a group of known villains in an attempt to conquer both universes. Doom, on the suggestion of the Super Skrull, decides to siphon the power cosmic from Galactus and his worldship in order to conquer both worlds. Wesker becomes intrigued with the power cosmic and agrees to assist Doom. Galactus eventually begins to notice the theft and attempts to consume both worlds in retaliation. While everyone is focused on Galactus, Wesker is left to his own devices.
In his ending, after Galactus is defeated, Wesker captures the weakened heroes to use as test subjects with the Uroboros virus.
It should be noted that Wesker lacks command moves that are overheads, making him weak on mixups other than teleport cross-ups, and thus limiting his options on opening his foes' defenses. This can be an understatement however, as Wesker must first put his opponent under pressure and trick them into blocking too much so he can feint into retreats or throws, which is a staple for all characters who use mindgames.
Abyss, known as the Armor of Erosion, is the antagonist in Marvel vs. Capcom 2: New Age of Heroes. He was responsible for a mysterious wind that spread across the world, killing plantlife in its wake. This phenomenon prompted numerous heroes and villains to band together and investigate. He's something akin to entropy incarnate, a fabled monstrosity that would bring the world back to primordial times, killing all life in the process.
Abyss's true form is apparently that of a large glowing sphere that hovers around in the background. Abyss changes into three different forms when fighting.
In the first stage of the battle the metal sphere surrounds itself with a giant suit of armor which is slow moving with powerful attacks. The fight takes place in a large temple like structure, presumably underground.
After this form is defeated, the armor melts into the floor and the temple crumbles, leaving the fighters standing in a green pool of slime. The abyss sphere floats in the background as the second form reveals itself; a small green humanoid capable of creating paralyzing bubbles, shooting fire and energy beams, and sinking into the floor to avoid attacks.
After this form is defeated, the green slime turns red and a large demonic beast forms around the Abyss sphere. This third form attacks with powerful energy attacks and sheer brute strength. If this form is defeated the sphere apparently loses its power and the cave and island the monster inhabits begins to sink.
Marvel vs. Capcom 2 has only one ending, which all the characters share. In it, the various fighters celebrate their victory over Abyss on the ship of the pirate Ruby Heart. Although this varies on which console the player is playing at: in the home console the characters that are available in the beginning celebrate only where as in the arcade version more characters are shown with a few changes to some scenes. At the start of this sequence, Ruby is seen holding Abyss's cracked sphere, which she drops into the ocean, and it sinks into the depths.
