Biochemist Dr. Henry "Hank" Pym discovers an unusual set of subatomic particles he labels "Pym particles". Entrapping these within two separate serums, he creates a size-altering formula and a reversal formula, testing them on himself. Reduced to the size of an insect, he becomes trapped in an anthill before he eventually escapes and uses the reversal formula to restore himself to his normal size. Deciding the serums are too dangerous to exist, he destroys them. Shortly afterward, he reconsiders his decision and recreates his serums. Pym's experience in the anthill inspires him to study ants, and he constructs a cybernetic helmet that allows him to communicate with and control them. Pym designs a costume made of unstable moleculesto prevent bites or scratches from the ants, and reinvents himself as the superhero Ant-Man. Pym eventually adopts his first alternate identity as the 12-foot-tall Giant-Man.