Real Name: Dr. Hank Pym.
AKA: Goliath, Yellowjacket
Powers: Utilizes Pym particles to change size, Cybernetic control of ants and yellowjackets (Yellowjacket), Genius level intelligence
Super scientist, Dr. Hank Pym uses special particles to change size. Originally the formula allowed him to shrink where he was attack by ants, though was rescued by a different species of ant. Later Pym would begin to control his size and use a helmet to communicate with and control ants. Initially formula was a liquid, then later gaseous, and finally by the time of Avengers #1 pill form. Later Pym would be able to control his size changing abilities via a cybernetic device in his costume. Pym was formerly married to a Hungarian defector who was kidnapped and murdered. Inspired to become Ant-Man so that he was no longer standing by while criminals were acting freely in the world. Pym would also be forced to confront romantic feelings he had for his partner Wasp, when she was grievously injured fighting Count Nefaria. (Avengers #13)
Ant-Man joined his girlfriend Wasp in taking a leave of absence from The Avengers after the defeat of The Masters of Evil and the death of Baron Zemo (Avengers #16). Pym and Van Dyne return to the Avengers after the team rescue Wasp from the undersea villain Attuma (Avengers #26). While initially able to expand his size to 25ft tall, Pym was eventually stuck at 10ft tall (Avengers #28), though this was later remedied. Soon the opposite became true and he would be unable to grow past normal human size. This was finally rectified in a fight against the Collector when Pym was forced to change size in desperation to save his teammates (Avengers #51).
After the Avengers were attacked by the reformed Masters of Evil (Avengers #55), it was revealed that their leader, Ultron 5, was in fact a creation of Pym’s. After it’s creation, the robot turned against its creator, erasing Pym’s memory and escaping (Avengers #58). Ultron then went on to create the android Vision to attack and lure the Avengers into a trap.
Pym suffered a mental break down causing him to create the persona of Yellowjacket (Avengers #59), which he used to then marry Wasp (Avengers #60). Following the return of his mental faculties, Hank chose to maintain the Yellowjacket persona and its accompanying boost of confidence (Avengers #68).
First appearance: Tales to Astonish #27
Joined Avengers: Avengers #1
Some Assembly Required 