X-Men II: Fall of the Mutants is an action-adventure game for MS-DOS compatible operating systems developed and released by Paragon Software in 1990. It follows the story of the X-Men crossover storyline "Fall of the Mutants". The game is the sequel to Paragon's 1989 X-Men: Madness in Murderworld.
Plot
The X-Men have come looking for their allies Storm and Forge, only to run into Freedom Force, who have been sent to capture them. Both teams are caught in a time warp caused by the Adversary, a powerful entity who has imprisoned Storm and Forge. Uatu the Watcher appears at the beginning and introduces the game as a parallel universe's version of the story from the "real" Marvel timeline in the vein of Marvel's What If? series, in this case, "What if a different team of heroes fought the Adversary?"[2]