The Toxic Avenger

Tromaville has a monstrous new hero. The Toxic Avenger is born when meek mop boy Melvin falls into a vat of toxic waste. Now evildoers will have a lot to lose.
A gang of thugs devise a cruel hoax that goes horribly wrong as Melvin, a nerdy emaciated janitor at the local health club, is cast through a third story window into a vat of hazardous toxic waste.