The Toxic Avenger (1984) 

Melvin is a social misfit who works in the Tromaville Health Club. He is always suffering the abuse of two bullies and their respective girlfriends and the four are also murderers. But all the abuse is going to end when Melvin accidentally falls into some barrels with toxic material. Now he is "The Toxic Avenger" and soon he will be the hero of Tromaville and a menace to the corrupt mayor. - IMDb

 

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