Ant-Man

Dr. Henry "Hank" Pym, also known as Ant-Man, is a biophysicist. He becomes a superhero after discovering a chemical substance that allows the user to alter their size becoming large as a giant and small as an ant. His helmet allows him to control ants.

"Experiences" with S.H.I.E.L.D.
When Jane Foster's equimpment was stolen, Henry Pym was referred to by Erik Selvig as the friend that he was going to email that had had previous "experience" with S.H.I.E.L.D.

Trivia

 * Nathan Fillion was in the running to play Hank before it was decided the character would not appear in The Avengers and never auditioned.


 * Despite he was mentioned in Thor, his name was cut from the film.