Mr. Sinister is a mysterious Evil Mutant mastermind who loves to plot and scheme but prefers to let others do the fighting for him. But if he's trapped and has to fight...watch out! He's super-strong and super tough...even cannon shells bounce off him! Mr. Sinister's goal is to make everyone-even Evil Mutants-his slaves! And what scares everyone is the fact that he has the power to make that goal a reality!