Sleeper (Marvel Comics). Sleeper is the name of several fictional characters appearing in American comic books published by Marvel Comics. The first Sleeper is the name of a series of five destructive robots created by the Red Skull. The second Sleeper is a Symbiote.

Publication history
The first Sleeper first appeared in Tales of Suspense #72 and was created by Stan Lee and Jack Kirby.

The second Sleeper was created by writer Mike Costa and artist Mark Bagley and first appeared in Venom #165, while making its first named appearance in Venom: First Host #3.

Fictional character biography

Robots

The Sleepers are five robots who were created by the Nazis as agents of destruction. They attack various villages in Europe and attempt to destroy the Earth by targeting its core before destroyed by Captain America.

The Machinesmith later restores one of the Sleepers and uses it to attack Avengers Island and free the robots incarcerated there. It is thwarted by Captain America and badly damaged before being repaired.

Symbiote
The Sleeper symbiote is the child of Venom, who initially keeps its existence secret from Eddie Brock. The two entrust Liz Allan with caring for Sleeper before it lobotomizes the Kree soldier Tel-Kar and takes over his body to explore the universe.

Powers and abilities
The Fourth Sleeper's robotic materials, design, and construction provide it with superhuman physical abilities and limited artificial intelligence. It additionally has optic lasers and could formerly become intangible and generate thermal energy.

The Sleeper symbiote has all of the powers of the predecessor's first human host Spider-Man. It also possesses limited shapeshifting, camouflage, and a Symbiote's autonomous defense capabilities. In addition, it is undetectable by Spider-Man's spider-sense and possesses chemokinesis.

In other media

Television
 The original Sleeper robots appear in the "Captain America" segment of The Marvel Super Heroes.
 A Sleeper robot appears in the X-Men: The Animated Series episode "Old Soldiers".
 Robots similar to the Sleepers appears in the Spider-Man episode "Six Forgotten Warriors". They were created to protect the Red Skull's "doomsday weapon".
 Multiple Sleeper robots appear in The Avengers: Earth's Mightiest Heroes episode "Winter Soldier". A Sleeper attacks the Avengers' Hydro-Base 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 the 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 a Mega-Sleeper before being destroyed by the Avengers.
 A variation of the Sleeper robots appears in the Avengers Assemble episode "The Sleeper Awakens", voiced by Liam O'Brien. This version is the Red Skull's A.I. system, referred to as Skull-Net.
 A variation of the Sleeper robots known as Sleeper-Mechs appear in the fifth season of Agents of S.H.I.E.L.D., serving as shock troopers for HYDRA leader USAF General Hale. S.H.I.E.L.D. agent Elena "Yo-Yo" Rodriguez later kills Hale's associate Anton Ivanov, disabling the robots in the process.

Video games
The Sleeper robot appears as the final boss in Captain America: Super Soldier. This version was discovered during the Middle Ages by Heller Zemo, who built Castle Zemo around it. Centuries later, during World War II, Heller's descendant Heinrich Zemo acquires the castle and activates the Sleeper before Captain America destroys it.

References

Characters created by Jack Kirby
Characters created by Stan Lee
Comics characters introduced in 1965
Comics characters introduced in 2018
Marvel Comics robots
Marvel Comics supervillains
Marvel Comics weapons