Dr. Henry "Hank" Pym
Dr. Henry “Hank” Pym is quite possibly the smartest man in the world, though his battles with anxiety and self-esteem have kept him in the shadow of Tony Stark and Reed Richards. His discovery of the Pym Particle, which causes matter to grow or shrink tremendously, is chief among his many scientific achievements. Pym has always used his genius to fight injustice, no matter the size.
Kidnapped by A.I.M. and Karla Sofen, Pym was placed under the mental command of The Controller, and was forced to act as a member of the Masters of Evil, using the alias “Yellowjacket”, and wearing a costume inspired by A.I.M.‘s uniforms. While under A.I.M.’s influence he also assisted in the creation of the homicidal robot Ultron.