In the mid-60s, Flex Mentallo operated as a superhero, battling the supervillains of the time with his mastery of "Muscle Mystery". At one point in his career, he fell in love and married a woman named Dolores. Flex kept no double identity, and was a well known figure in his hometown. One day, while on a picnic with Dolores, Flex heard a small boy crying for help and went to investigate. Discovering the boy, Flex saw the child's kitten was stuck in a tree and used his powers to get it down. Unfortunately, what had seemed to be a routine superhero moment was in reality a trap. Flex was captured by the Bureau of Normalcy and held prisoner for decades, restrained so he couldn't use his powers to escape.

Atom Ryan Choi 0027
DC Rebirth Logo

This section of the article does not provide a complete profile of the subject. You can help out by providing additional information, expanding on the subject matter in order to bring this article to a higher standard of quality.
This template will categorize articles that include it into Category:Incomplete Articles.


  • Muscle Mytsery: Flex Mentallo derives his powers from a strange energy source known to him as the "Muscle Mystery". Flex is capable of doing more or less anything by flexing his muscles.[1]
    • Reality Alteration: By flexing his muscles Flex Mentallo can manipulate reality. He was able to materialize a flower as well as picnic by flexing his muscles. While his powers were restrained he was still able to tear a hole in a wall and then repair the damage done by flexing his muscles. Once again while in this restrained form Flex was able to send a man flying across a room multiple times by flexing his eye muscle. Finally in a fit of rage Flex was able to burst all of the lights in a surrounding city by flexing his muscles.[1]



Community content is available under CC-BY-SA unless otherwise noted.