Synopsis for the TV Cartoon The Man Who Knew Superboy's Secret, Watch Video

After changing from Superboy to Clark, a costumed figure shows it knows he is Superboy. The man says he is from Krypton too but grew up on another planet. He has Superboy meet him later and then claims he knows of an antidote to kryptonite. He is really an alien from another planet who Superboy has previously thwarted, and hopes to trick Superboy into losing his powers and being captured. But Superboy had noticed he had a scar and so was suspicious.