Riot, also known as Frederick von Frankenstein, is a super-villain and an enemy to Superman. His career began as a brilliant scientist and he used a phase shifter to work on multiple projects at once. This unlocked a metahuman ability inside him to create duplicates of himself. Unfortunately, having multiple bodies meant he could never really fall asleep, and the sleep deprivation drove him insane. He would later become a member of the Superman Revenge Squad. Riot was created by Louise Simonson and Jon Bogdanove, first appearing in Superman: The Man of Steel #61. (1996)

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