Doctor Henry Jonathan "Hank" Pym is an entomologist and physicist, who developed the Ant-Man Suit, after discovering the Pym Particles. For a time, he worked for S.H.I.E.L.D. as a consultant and became the original Ant-Man, fighting beside his own wife, Janet van Dyne, who had taken on the mantle of the Wasp, as they took on missions together, including one to capture his former ally, Elihas Starr. However, during a mission to stop a Soviet Union missile, Ant-Man witnessed the Wasp sacrificing herself to save millions of lives, as she had become trapped within the Quantum Realm, with seemingly no way to save her. Pym then changed directions and had founded Pym Technologies while also retiring as the Ant-Man, vowing never to use his invention again, turning his back on S.H.I.E.L.D. as he had found that Howard Stark and Mitchell Carson had tried to recreate his original designs for S.H.I.E.L.D.'s purposes. Despite retiring from heroics for many years, Pym was forced into actions as he had learned that his former protege, Darren Cross, had recreated the Pym Particles and planned to use it to create the Yellowjacket Suits, which Cross would then sell to organizations such as HYDRA and the Ten Rings. Pym had then joined forces with his daughter, Hope van Dyne, as they recruited Scott Lang to use the Ant-Man Suit, and steal away the Yellowjacket designs from Cross. Despite some troubles to get Lang to master their technology, Pym's plan eventually succeeded and Cross was defeated. However, during the final fight, Lang had found himself transported inside the Quantum Realm and successfully escaped, giving Pym a new hope that he could save his wife. Pym also gained a respect for his own daughter's abilities, as he finally gave her a new Wasp Suit.