Lex Luthor has a green Kryptonite crystal that can rob Superman of all his powers! Put the Man of Steel into his mech and prepare for a super-sized showdown. Use the mighty machine s movable arms, legs and fingers to take on the evil Super-Villain. Then take the action to new ...Lex Luthor has a green Kryptonite crystal that can rob Superman of all his powers! Put the Man of Steel into his mech and prepare for a super-sized showdown.