Despite the brilliance of Hank Pym (Michael Douglas), a flashback sequence in the film's opening shows not everyone at S.H.I.E.L.D. saw eye-to-eye. Butting heads with Peggy Carter and Howard Stark, Hank lets his frustrations out on Mitchell Carson (Martin Donovan). He would later return to be revealed as a
HYDRA agent, but comic fans could have predicted his turn. In the comics, Mitch Carson was a S.H.I.E.L.D. agent who hunted down Eric O'Grady's 'Ant-Man' after he was disfigured by the 'hero' in a fight - eventually revealed to be a corrupt agent.