Because Metalhead had all the turtles personalities, it was subject to dissociative identity disorder. Donatello later reprograms Metalhead to fight for the turtles, but because of its instability due to the multiple personalities, Metalhead went haywire and attacked everyone, Donatello was able rig some of the broadcasting equipment at the Channel Six News Building to deactivate Metalhead. Metalhead realized that the Turtles were his friends and became their servant. He was only seen again when Donatello tries to get him to vacuum their TV room in episode Big Bug Blunder.
His original action figure bio described him as "The original Party robot!". The figure featured an arm with swappable mecha-nunchuks, a backpack with scanner and video games, and vac-metallized detailing. The figure was later re-issued as a roboticized Michealangelo.