Not much has been revealed regarding the early life of the Inuit (Eskimo) mutant known as Harpoon. The details of his recruitment by Mister Sinister to the group of assassins known as the Marauders remains similarly unrevealed. Relentlessly deadly and fiercely devoted, Harpoon invaded the Morlocks' underground tunnels in New York City, intent on wiping out their entire population. Despite fierce resistance from the X-Men, they were merely distractions from the task at hand. While the other Marauders murdered Morlocks, Harpoon plunged his spear into Angel's wings, necessitating their later amputation. He also caused Shadowcat to become trapped in a phased state and seriously injured Colossus, temporarily preventing the mutant�s body from turning back into flesh from its steel form. During the demonic invasion of New York, Harpoon was killed in a conflict with the X-Men. Like many of the killed Marauders, he resurfaced again as a clone created by Mister Sinister.
After M-Day Harpoon was depowered. He was shown again with the Marauders and fought with just a single harpoon.
He later appeared alongside the Marauders forcibly gathered by Da'o Coy Manh and attacked the X-Men. He was eventually found dead, having been killed simultaneously in combat with Arclight.
Somehow resurrected, Harpoon and the Marauders struck off on their own, once again massacring the Morlock population. This lead an angered Chamber, their new leader, to rejoin the X-Men. When the X-Men re-encountered the Morlocks, the Marauders fought briefly, but ultimately surrendered, professing their innocence. Not believing them, Chamber burned them to death with his psionic flame. Having not been a victim of this attack, Harpoon struck Chamber down before being executed for his actions by Hope Summers.
After the X-Men relocated to the mutant island known as Krakoa, Harpoon was not among the mutants to join them. The Hellions were sent to investigate one of Mister Sinister's former cloning farms. Inside, Madelyne Pryor had captured the clones of the Marauders and used them for a mysterious ritual.
