CITIZEN TOXIE: THE TOXIC AVENGER IV. When the notorious Diaper Mafia take hostage the Tromaville School for the Very Special, only the Toxic Avenger and his morbidly obese sidekick Lardass can save Tromaville. However, an explosion results in some unforeseeable consequences where it creates a dimensional tear between Tromaville and its dimensional mirror image Amortville. While the Toxic Avenger (Toxie) is trapped in Amortville, Tromaville comes under the control of the superhuman powered hero's evil doppelgänger the Noxious Offender (Noxie). With the citizens of Tromaville unaware of the switch, Mayor Goldberg decides to combat "Toxie" by calling in every superhero he can afford.