Marvel Gold. Capitán América #1

Synopsis

Cap fights a seemingly-hopeless battle against The Red Skull who, armed with The Cosmic Cube, can do anything he wishes with a thought. Cap turns the tables by pretending to become the Skull's servant. The Skull fashions a suit of armor made of solid gold. Cap wrestles with him, trying to knock the Cube from his grip. At his thought the island breaks up and sinks into the ocean. Cap knocks the Cube into the water and The Skull dives after it before he realizes that the armor's weight drags him to the ocean floor. The Cube becomes buried in the deep as Cap hopes it will be lost forever.