The Healer was an aldor man whom lived with the underground mutant race known as the Morlocks. Together with a few other Morlocks, Healer was one of the few that managed to escape the massacre of their community by the superhuman team of assassins known as the Marauders. He was however captured by the Marauders named Sabretooth. Sabretooth had been slaughtering many more Morlocks, and was about to kill Healer. Luckily, the X-man Wolverine intervened at that same time. Logan knew how valuable the Healer could be in treating all the wounded Morlocks and got Sabretooth to let him go by saying "your fighting old men now, is that the best you can do or wanna try fighting against a real challenge?" namely, himself. His plan worked and Sabretooth let Healer go as a brutal fight erupted between Wolverine and Sabretooth, with Wolverine coming out victorious. The Healer was dispatched to Muir Island, home of the genetic research station run by Moira MacTaggert, to tend to the wounded survivors of the massacre.
Years later, after the surviving Morlocks had returned to the underground, the Healer sought out the Morlocks' former leader, Callisto, to enlist her aid in resuming leadership of the Morlocks following the death of the usurper, Masque. Rejecting the Healer's request, Callisto was attacked by the Morlocks and both she and the Healer were injured in the battle. Seeking refuge with the superhuman mutant adventurers known as the X-Men, the Healer gave the final measure of his power to heal Callisto, leaving him a lifeless husk.
Healer has the ability to tap into certain mutant genes in the human body in order to heal people's wounds, this power caused him great strain and pain to use, especially in extensive use. Healer was not able to heal any normal human or non-active mutant as his powers only work on active mutants.
X-Men The Animated Series
He appeaered in numerous episdoes in the series, accompanied with the rest of his fellow Morlocks.
Here Healer appeared as a NPC. Healer was a great ally to the Gene Nation leader Marrow, and he was thought of as the one who kept peace under Marrow's fiery temper. He also supplied the player's characters with equipment.