Real Name: Nathan Finch
Occupation: Criminal
Marital Status: Single
Base of Operations: Gotham City
Height: N/A
Weight: N/A
Eyes: N/A
Hair: N/A
First Appearance: N/A
Created By: N/A

While he was kidnapping and holding his boss' daughter for ransom, Nathan Finch ran afoul of Batman who rescues her. Unfortunately, he wasn't able to save Nathan from falling to an icy death. Nathan Finch's body was discovered by two down-and-out people who take him to an unnamed underworld doctor. It turned out that Nathan wasn't dead and the doctor wanted his knowledge of cybernetics. Due to ravages of frostbite, the doctor removed his arms and legs and replaced them with cybernetic arms and legs. Nathan becomes Gearhead and develops his own cybernetic arsenal of removable body parts as well as a goal to exterminate Batman, whom he refers to as the "vermin".

He played a part in the Robin section of the No Man's Land, in which he is one of a number of villains competing for control of Gotham City's sewers. Without the use of his cybernetics arms and/or legs, he is forced into partnership with the thuggish Tommy Mangles, who carries his torso about. The duo are iced by Mr. Freeze, a fate particularly frightening for Gearhead, given his origin.