Name: Sleeper
Aliases: Michael "Mackie" Messer, Mackie "Knife" Messer
Occupation: Mercenary, Assassin
Affiliations: The Committee, American Security Council, Astronomer, Bloat
Height: 6' 2"
Weight: 185 lbs
Eyes: Blue
Hair: Black

Known Relatives: None

History:
Michael "Mackie" Messer was a small-time criminal who became a sleeper agent for the alien race known as the Swarm. After years of living a double life, Mackie was activated and transformed into a powerful and deadly warrior known as Sleeper.

Sleeper has been hired as a mercenary and assassin by various organizations, including the Committee and the American Security Council. He has crossed paths with many of the other Wild Cards, both as allies and enemies. Sleeper is known for his stoic demeanor and brutal efficiency, but has also shown a more compassionate side on occasion.

Powers and Abilities:
Sleeper possesses a variety of superhuman abilities, including enhanced strength, speed, and durability. He has sharp claws and teeth that can tear through most materials, and can regenerate from injuries at an accelerated rate. Sleeper can also fly and has limited telepathic abilities.

Equipment:
Sleeper carries a variety of weapons, including knives and guns. He also wears a suit of armor that enhances his already formidable strength and durability.

Limitations:
Despite his impressive powers, Sleeper is vulnerable to psychic attacks and mind control. He also has a weakness to cold temperatures, which can slow down his regenerative abilities.

Threat Level:
Sleeper is classified as a high threat level due to his superhuman abilities and ruthlessness as an assassin. He has been responsible for numerous deaths over the years and is considered a dangerous individual to cross paths with.