The Sleeper is a series of robots created for the Red Skull by Nazi scientist. The Sleeper robots were used to fight for Nazism during World War II but all have been destroyed by Captain America . The most powerful Sleeper was the Fourth Sleeper because it had the ability to control its density and had the ability to become a living volcano. It was controlled by a sonic crystal key and the Sleeper would respond to the brainwaves of the individual holding it. The Sleeper was activated when the Red Skull was given the crystal key by a Nazi named Von Krimm. Captain America was being held captive at the time and saw the awakening of the Fourth Sleeper first hand. The Red Skull had a difficult time controlling the Sleeper and was attacked by Nazi soldiers. During the chaos, Captain America escaped and managed to take the crystal key away from the Red Skull. The Sleeper erupted again causing the Red Skull's secret shelter to collapse and seawater began to flood the base. The Red Skull had disappeared and Captain America resurfaced with the crystal key.

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