He was created by Percival Tachyon alongside Rusty Pete and after betraying Captain Darkwater became the new leader of his crew of robotic space pirates. He met Ratchet and Clank and after a battle Slag was reduced to a head. In Ratchet & Clank Future: Quest for Booty Pete revives Slag and place him on a stick, then he was revived by placing into Darkwater's body. After trying to share the body with Darkwater and attempting to destroy Ratchet, Slag was reduced to a head again and ordered Pete to get him a new body. In Ratchet & Clank Future: A Crack in Time, Slag and Pete appeared in Qwark's film "My Blaster Runs Hot" and ran their own radio station.