He was made by the mad scientist Dr. Oonagh Mullarkey, using both human and animal DNA, as a form of expendable supersoldier, and designed to mature at a rapid rate.

When Motormouth was shot in the throat, Julius used his innate mechanical instincts to repair her with technology, giving her a sonic scream as well as integrating the MOPED device into her body.

[volume & issue needed] Later, Killpower, Death's Head, Dark Angel, the Incredible Hulk, and other heroes are kidnapped to take part in brutal gladiatorial games.

Killpower uses his technological skills to help the heroes overthrow the leader of the games and destroy his plans to conquer all reality.

[3] However, due to his immunity to magic spells (part of why he was on standby to rescue Hussain's family), he is not under Dracula's control and acts as an undercover agent when MI:13 starts their assault.

The other heroes were unable to rescue him and Killpower was left trapped there, terrified and manipulated by Mephisto into believing his friends did not care enough to get him out.

Years of manipulation turned him into a rage-driven, murderous beast who, at Mephisto's urgings, would lead a demonic invasion on Earth.