Heavy is a clunky, silver robot created by Dr. Ivo Robotnik in 3235. Designed to tap into any database and act as a system's repair unit, both he and Bomb were one of the few robots created by the despot that had their own free will, which was what resulted in Heavy and Bomb abandoning Dr. Robotnik and joining the Chaotix. They would subsequently join the Royal Secret Service before being reprogrammed by Dr. Eggman, only to be destroyed. Eggman subsequently rebuilt them, only for them to suffer destruction; the Freedom Fighters later rebuilt these new models with the personalities of their former selves to serve on Team Freedom.