Stockman takes center stage in the unaired "Insane in the Membrane". Stockman is revealed to have had a relatively happy childhood until the death of his loving mother, who encouraged him to follow his dreams and that "the sky's the limit". Having cloned a new human body for himself, Stockman happily enjoys being human again, indulging in things he has missed since becoming a cyborg. However, after experiencing a hallucination of his late mother, Stockman realizes his body is deteriorating. When efforts to save himself fail, Stockman eventually comes to believe April is the cause of all his suffering. Having lost his sanity, Stockman kidnaps April and attempts to kill her, but the Turtles and Casey Jones intervene and the chase takes all parties to a gondola. Stockman nearly kills April before hallucinating that April is his mother, who despairs over Stockman's descent into villainy and madness. Stockman then sacrifices himself by helping April out of the gondola, which crashes into the river below. However, Leonardo observes that he has survived worse fates and only time will tell if he eventually comes back.