Marvel: Ultimate Alliance

Continuity mistake: When inside Mephisto's realm, Jean Grey and Nightcrawler are both kept in cages and Blackheart informs the player that only one of the heroes can be saved, but the other hero will die. If the player chooses to save Jean Grey, then Nightcrawler will fall into the pit, and for a short while aid Mephisto before sacrificing himself. After the game is over, one of the cut scenes will say that Mystique, upset over the death of Nightcrawler, kills Professor Xavier. When it shows Professor Xavier's tombstone, Nightcrawler is seen standing next to it.