You're the one I always felt the sorriest for, Ajax... because you were just too stupid to know any better. 
History
Ajax's history is presumably similar to his Earth-616 counterpart's.
After humankind was devastated by nuclear war and biological attacks, Ajax helped Atalanta get revenge on the Black Scythe organization[1] for the death of their teammate Prometheus.[2]
The Pantheon then went into seclusion and lived in a base beneath Canada's Columbia Icefield. One day, Delphi sensed that the Pantheon's former teammate Hulk had survived, was now going by the moniker of the Maestro, and was the middle of conquering Washington, D.C. Delphi informed the rest of the Pantheon. Hector and Ulysses wanted to stop the Maestro, but Atalanta was against it, having grown disillusioned with protecting humankind after its devastation. Later, Ajax and the rest of the Pantheon discovered that their base had been discovered by Doctor Doom, and he demanded to be let in.[3]
Atalanta told her team to ignore Doom, but he promptly teleported himself into their base, forcing them to hear him out. Doom told the Pantheon that the Maestro planned on conquering the world, which interfered with his own needs. The Pantheon and Doom then came up with a plan to stop the Maestro. The Pantheon met with Maestro, but Ajax attacked Maestro, falsely believing that he was attacking Atalanta. Maestro was able to convince to stop attacking. As the two parties talked, the Pantheon told Maestro that A.I.M. had killed their member Prometheus and wanted revenge. Maestro agreed to help the Pantheon, and they took off for A.I.M's base in the Pantheon's jet. Maestro eventually grew suspicious and asked how Prometheus died. Ajax accidentally let it slip that Prometheus didn't die by A.I.M.'s hands. Maestro threatened the Pantheon but was then rendered unconscious by a powerful knockout gas provided by Doom.[2]
The Pantheon knew they couldn't keep Maestro in stasis indefinitely. So, Paris agreed to enter Maestro's mind and revert him back to Bruce Banner so he was easier to deal with. Paris tricked Maestro into thinking he broke free of stasis and killed most of the Pantheon. Paris then used an illusion of Maestro's mother Rebecca which affected Maestro emotionally, causing him to turn back into Bruce Banner. This allowed Paris to shoot Banner to death with a handgun.[4]
However, Banner recovered from his gunshot wounds despite not being in his Maestro form. So, Atalanta had Banner sealed away permanently in duranium. The duranium failed, though, and Banner broke free after transforming back into Maestro. Ajax and the rest of the Pantheon confronted Maestro as he was breaking into their base's missile room. When Maestro took Atalanta hostage, Ajax tried to rescue her, but Maestro easily fended him off. Maestro then forced Ulysses to fire missiles at A.I.M.'s base in Los Angeles. Despite that, Maestro killed Atalanta anyway. Ulysses thought he would, though, and chose to launch missiles at the Pantheon's base. While Maestro fled, Ajax and the rest of the Pantheon huddled around Atalanta's body and waited for their eventual demise.[5]