Sabretooth (Victor Creed) is a fictional character appearing in American comic books published by Marvel Comics, most commonly in association with the X-Men, in particular as an enemy of Wolverine. Created by writer Chris Claremont and artist/co-writer John Byrne, the character first appeared in Iron Fist #14 (August 1977). Sabretooth was originally portrayed as a non-powered serial killer but was later written as a mutant possessing bestial superhuman abilities, most notably a rapid healing factor, razor-sharp fangs and claws, and superhuman senses. He is a vicious assassin, responsible for numerous deaths both as a paid mercenary and for his personal pleasure. Accounts as to the origin of his enmity with Wolverine are conflicted. It is known that Wolverine and Sabretooth were participants of the Cold War supersoldier program Weapon X, and that Sabretooth saw Wolverine as competition and therefore antagonized him. While Wolverine is depicted as suppressing his more savage qualities, Sabretooth does the opposite and embraces them, until the events of the 2014 storyline "AXIS".
Source: Wikipedia, "[en.wikipedia.org/wiki/Sabretooth_%28comics%29 Sabretooth (comics)]", available under the CC-BY-SA License.