Red Skull
But while the Red Skull always admired Hitler for his ideological vision, he was never fully content with being Hitler's subordinate. The Red Skull kidnapped and killed many of Hitler's closest advisers and eventually rose to become the second-most-powerful man in the Third Reich. Now Hitler could no longer effectively control the Red Skull and came to fear him, especially since the Red Skull had made no secret of his ambition to supplant Hitler someday.