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 #27 (January 1962). The persona was originally the superhero alias of the brilliant scientist Hank Pym after inventing a substance that allowed him to change size; however, Scott Lang and Eric O'Grady have also taken on the Ant-Man mantle.