Bonebreaker is a fictional cyborg assassin featured in comic books published by Marvel Comics. He is associated with the X-Men line of titles, and has also made appearances in issues of Wolverine. Bonebreaker, who's true name is unknown, worked as a mercenary and an assassin under the employ of Donald Pierce. He underwent severe cybernetic augmentation, and had his legs removed and replaced with a motorized chassis with tank treads. Additionally, he had various weaponry incorporated into his chassis including anti-aircraft missiles and machine guns. He was a member of a group called the Reavers, who were stationed out of a facility in the Australian Outback. Bonebreaker and the other Reavers fought up against the X-Men on several occasions during a time when the world had believed that the X-Men were dead.