Much like the X-Men's Wolverine, Sabretooth possesses a mutant healing factor and powerful savage instincts. Unlike Wolverine, however, Sabretooth has spent his life embracing his savage nature wreaking Unforgivable [sic] destruction and tragedy for mutants and human alike! It is because of his vicious past the X-Men accepted Sabretooth into their custody, holding him with specially designed restraints in their Danger Room. And should Sabretooth try to escape his confinements Wolverine and the X-Men will be waiting for him.