Ant-Man

Ant-Man is the name of several fictional superheroes appearing in books published by Marvel Comics. Created by Stan Lee, Larry Lieber and Jack Kirby, Ant-Man's first appearance was in Tales to Astonish #35 (September 1962). The persona was originally the brilliant scientist Hank Pym's superhero alias after inventing a substance that can change size, but Scott Lang and Eric O'Grady also took on the mantle after the original changed his superhero identity to various other aliases.

https://en.wikipedia.org/wiki/Ant-Man