Apocalypse is a major villain in the X-Men franchise and appears as a powerful boss character in X-Men vs. Street Fighter. He is an ancient mutant with immense strength, energy manipulation, shapeshifting, and advanced technology at his disposal. In the game, he serves as the final antagonist, representing overwhelming power and the threat of domination over both the X-Men and Street Fighter fighters. His role is that of a towering endgame challenge and a symbol of mutant supremacy.