Molecule Man (real name Owen Reese) is a supervillain from Fantastic Four comics. He is an enemy of the Fantastic Four and later reforms.
He is often portrayed as a supervillain, but sometimes takes the role of a reformed outlaw or reluctant hero.. He is also said to be the most powerful being in the universe, albeit allegedly.
The Molecule Man was created by Stan Lee and Jack Kirby, and first appeared in Fantastic Four #20.