Sleeper (Marvel Comics)

Sleeper is the name of several fictional characters appearing in American comic books published by Marvel Comics. The Sleepers are depicted as a series of five destructive robots created by the Red Skull.

Fictional character biography
The Sleeper was the most powerful of five doomsday robots designed in Berlin by Nazi Germany as agents of destruction. After World War II, the Sleeper was entombed within a crypt that was sunk into the sea. The first three robots were activated by agents at a certain time in European villages, consisting of a giant human-like robot with blaster rays, a winged robot, and the 'brain', which resembled the Red Skull and was a powerful bomb. Despite Captain America and the personnel of a nearby US Army base's attempts to stop them, the robots combined and flew towards the North Pole. While in pursuit with the military, Captain America surmises that the first Sleeper would use its blasts to dig into the ice, enabling the robot to travel into the Earth and explode, destroying the world, as the Red Skull had vowed that if he could not conquer the world, he would destroy it. To prevent this, Captain America is able to board the combined vehicle in midair and detonate the bomb early with a flamethrower, destroying the three Sleepers. The crypt containing the fourth Sleeper was retrieved from the sea in modern times, and when the Sleeper reactivated it destroyed a seacoast smelting factory and battled Captain America. The Sleeper was ultimately rendered intangible by a "sonic crystal". Similarly, the Red Skull later activated the fifth Sleeper, only to have it stopped by Captain America and the Falcon as well.

The fourth Sleeper was later restored to tangibility by the Machinesmith and was used as a "Trojan horse" to gain entrance onto Avengers Island in order to liberate the various robots incarcerated there. It was thwarted by Captain America, and badly damaged.

The damage done to the fourth Sleeper was later repaired by the Machinesmith. The Sleeper was animated by the Machinesmith to join the Skeleton Crew in search of the missing Red Skull. It battled Hellfire Club mercenaries, and the Black Queen. Replicas of the five Sleeper robots were then pitted against Captain America and Diamondback.

Powers and abilities
The fourth Sleeper's robotic materials, design, and construction provide it with superhuman strength, stamina, durability, and reflexes. It possesses a limited artificial intelligence, with a capacity for limited self-motivated activity. The Sleeper is programmed to be moderately proficient at hand-to-hand combat. The Sleeper has repulsor-ray blasters mounted in its eyesockets.

Originally the fourth Sleeper could alter its density from its natural tempered steel form to total intangibility. The circuits that controlled this function have burned out and have not been replaced. The vibration of a certain "sonic crystal" caused the Sleeper's intangibility control to malfunction. The Sleeper originally could also generate "volcanic" thermal energy and project it through its faceplate. This function has also apparently been eradicated.

Television

 * The original Sleeper story appeared in the Captain America segment of The Marvel Super Heroes. In particular, it is seen in "The Sleeper Shall Awake", "Where Walks the Sleeper", and "The Final Sleep".
 * A Sleeper robot appeared in the X-Men animated series episode "Old Soldiers", wherein it was defeated by Wolverine and Captain America.
 * Robots of a similar design to Sleepers appeared in the Spider-Man animated series' "Six Forgotten Warriors" saga. They were created to protect the Red Skull's "doomsday weapon" and were initially defeated by the Six Warriors, the Kingpin, and the Insidious Six, but were later reactivated by Electro to attack the United Nations. They were defeated once again by the Six Warriors.
 * The Sleeper appears in The Avengers: Earth's Mightiest Heroes animated series episode "Winter Soldier". A Sleeper attacks the Hydro-Base in order to break out the Red Skull. While Captain America and Nick Fury are looking for the Winter Soldier, they find him fighting a Sleeper and help him defeat it. Afterward, the Winter Soldier tells them Sleepers were activated after the Avengers foiled the Red Skull's campaign as Dell Rusk. Five Sleepers are activated in Washington D.C. and combine into one Mega-Sleeper to destroy it. However, the Avengers are able to distract it while Captain America and the Winter Soldier confront the Red Skull as he is piloting the robot. Their resulting fight damages the Mega-Sleeper, allowing the Avengers to destroy it.
 * A variation of the Sleeper appears in the Avengers Assemble animated series episode "The Sleeper Awakens", voiced by Liam O'Brien. This version is referred to as Skull-Net, the Red Skull's A.I. system, and battles the New Avengers.
 * A variation of Sleepers known as Sleeper-Mechs appear in season five of Marvel's Agents of S.H.I.E.L.D. as shock troopers for lone HYDRA leader, United States Air Force General Hale. Introduced in "All the Comforts of being Home", they are remote-controlled by Hale's cybernetic associate, Anton Ivanov. Ivanov and the Sleeper-Mechs continued to serve Hale until "The Honeymoon", when S.H.I.E.L.D. agent Yo-Yo Rodriguez kills the former, disabling the robots.

Video games

 * The Sleeper appears in Captain America: Super Soldier. It was discovered during the Middle Ages by Heller Zemo. Though they did not understand what the Sleeper was, Heller and his men realized it was something important and built Castle Zemo around its resting place. Hundreds of years later, during World War II, Heller's descendant Heinrich Zemo acquired the castle, believing he was destined to awaken the Sleeper and use it to help him in his plans for world conquest. However, he formed an alliance with Johann Schmidt, commander of HYDRA, who occupied Castle Zemo so Schmidt's top scientist Arnim Zola could study the Sleeper. In 1944, the castle was infiltrated by Captain America, who successfully destroyed the Sleeper after it was activated.