Victor Creed is the feral mutant called Sabretooth. He was a member/subject of the Weapon X Project and is the arch-enemy of Wolverine. Unlike Wolverine, Sabretooth embraces his primal instincts, leaving death in his wake. Due to a spell gone wrong by Scarlet Witch, Sabretooth got inverted and became a more heroic person for a while. During a mission with Weapon X-Force, he decided to lose his mind and free the beast to save his team. Overwhelmed, Mentallo shot Victor with Domino's gun, which sent him into the pit as Stryker's final sacrifice. In retaliation, Deathstrike delivered the fatal strike to Mentallo while Monet mourned Victor's death.
Reentering Hell, Victor decapitated Stryker which completed his mission and effectively ended his revival. Sabretooth used his sacrifice to allow Graydon to be reborn instead, fulfilling his earlier promise to save his son. When Marduk encountered Victor again, he was completely feral and unable to speak. Marduk didn't want to claim Victor while he was mentally compromised and unable to comprehend his situation. He opened a door to the living world and released the feral Sabretooth into the Saskatchewan woods, telling him to embrace his true self and earn his way back to Hell.
Current Version:
Sabretooth
Former Versions:
Sabretooth (Weapon X)
Sabretooth (Inverted)