The Giant Mouser Robot was the first stage boss of the 2003 video game, appearing at the end of Stockman's lab in the "Things Change" stage, and two appear later as a sub-boss near the end of the "Mouser Arsenal" area of the final stage "Justice". In the GBA version of the game, you fight the Giant Mouser in Baxter Stockman's lab, at the end of Leonardo's act. In TMNT: Mutant Melee, one served as an obstacle, chasing players through a sewer level. Two Giant Mousers, who simply looked like larger versions of the regular Mousers, served as the first boss fight in Teenage Mutant Ninja Turtles: Battle for the City.