Ant-Man
The amoral Eric O’Grady grows up in Lancaster, Vermont, with his best friend Chris McCarthy. They both become low-ranking S.H.I.E.L.D. agents, assigned to perform data entry aboard the Helicarrier. Their poker buddy, S.H.I.E.L.D. agent Mitch Carson, assigned them to guard “Hank Pym” (actually a Skrull imposter)’s new “GI Ant-Man” armor; paranoid about receiving a serious task, O’Grady panicked when “Pym” entered the room and knocked the scientist out. Seeing the suit, McCarthy tried it on and accidentally activated it, shrinking out of sight. O’Grady, using his friend’s disappearance to try to get closer to Chris’ girlfriend and fellow agent Veronica King, told her Chris was cheating on her. Days later, while the Helicarrier was besieged by an army of Hydra-brainwashed superhumans, Chris figured out how to re-enlarge and found Eric, only to be slain by a Hydra minion moments later. As the damaged Helicarrier plummeted to the ground, Eric removed the suit from Chris’ body, donned it and shrunk down, surviving the crash. Veronica subsequently accompanied Eric to Lancaster for Chris’ funeral, where they became closer and nearly made love atop Chris’ grave.
O'Grady's GI Ant-Man armor, originally designed by a Skrull impersonating Hank Pym, can shrink or enlarge via Pym Particles; this ability is controlled by a button on the helmet's side. He can shrink to “ant-height" of a tenth of an inch, and enlarge to a maximum height of 100', although he cannot maintain such a height for very long. He apparently cannot shrink or enlarge other objects or people.
