Sabretooth is an immortal/mutant villain from the Marvel Universe that frequently encounters Wolverine and The X-Men. Sabertooth, born Victor Creed, first displayed his mutant abilities by murdering his brother over a piece of pie. In retaliation, Victor's father chained him up as a beast and sawed down his "devil teeth".
Victor chewed off his own hand to break free of his chains and murdered his father for revenge. Victor's mother died a few years later and, free of parental control, Victor went on a murderous spree across Canada. Victor joined a number of violent groups that were responsible for the murder of Wolverine's lover, Silverfox, and his wife Itsu. These actions are, initially, what pit Wolverine and Sabertooth against one another and enforce their roles as arch enemies.