Nemesis Kid

Nemesis Kid possessed the superhuman ability to spontaneously develop the powers appropriate to defeat any one opponent for the duration of the battle, though against more than one opponent his powers would either work against only one target, allow him to escape the situation, or fail to work at all. In his first appearance, he infiltrated the Legion of Super-Heroes on behalf of the alien Khunds. When his deception was revealed, he tried to frame Karate Kid as the traitor; when that failed, he fled.

He later became a founding member of the Legion of Super-Villains. When the Legion of Super-Villains invaded the planet Orando under his leadership, Nemesis Kid defeated Karate Kid in single combat and killed him. Karate Kid's widow, Princess Projectra, attacked him using her power to generate illusions; once he had adapted an immunity to her illusions, Projectra attacked him from behind, beat him unconscious, and broke his neck, killing him.