Later, Jack moved past his mission of blind vengeance and became a true hero, working with various other superheroes such as the Defenders. Jack fought the Thing, who was under mental control of the Machinesmith. Jack Hart was then reunited with a college girlfriend named Marcy Kane (who was also a fellow graduate student of Peter Parker, a.k.a. Spider-Man). Marcy, a scientist, and S.H.I.E.L.D. offered to help find a cure for Jack's dangerous super powers. Jack fought some S.H.I.E.L.D. agents, and his powers were temporarily dampened by Spider-Man. Marcy turned out to be a Contraxian agent sent to Earth to find Jack. It was at this time Jack learned of his half-Contraxian heritage. Marcy took Jack to Contraxia, where he discovered that his powers had increased exponentially, and saved the home-world of his mother by reenergizing its dying sun. The Contraxians could not find a solution for Jack's unstable powers, and he left Contraxia to wander outer space in exile.