After being condemned to permanent exile from planet Astra for his attempt at global domination, the Metal Master reaches the Earth and intends to conquer it using his absolute power over anything made of metal. When he meets the Hulk for the first time, he easily manages to knock him out by taking the monster off-guard. Then he goes on a rampage, destroying key industries and constructions around the world. He meets the Hulk a second time in Washington, D.C. and scoffs at the creature who dares threaten him with a rocket launcher. The Metal Master makes several attempts to blow the weapon to pieces but each of them fails. Then the Hulk catches the Metal Master to repair all the damages he made around the world. Afraid for his life, he complies. Then when the green monster releases him, the alien gets to his ship and leaves the planet, unaware that he has been fooled by a plastic weapon.