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Hugh Jackman as James Howlett / Logan / Wolverine: The mutant and future X-Men member. Jackman, who played Wolverine in the previous films, has also become producer of the film via his company Seed Productions, and earned $25 million for the film.[2] Jackman underwent a high intensity weight training regimen to improve his physique for the role. He altered the program to shock his body into change and also performed cardiovascular workouts. Jackman noted no digital touches were applied to his physique in a shot of him rising from the tank within which Wolverine has his bones infused with adamantium.[3]
Troye Sivan as James: Casting directors cast Sivan as the young Wolverine after seeing him sing at the Channel Seven Perth Telethon, and he was accepted after sending in an audition tape.[4] Kodi Smit-McPhee was originally cast in the role, when filming was originally beginning in December 2007,[5] but he opted out to film The Road.[6]
Liev Schreiber as Victor Creed: Logan's half-brother and fellow soldier. Jackman and Hood compared Wolverine and Sabretooth's relationship to the Borg-McEnroe rivalry in the world of tennis: Victor hates him because he loved and needed his brother, but is too proud to admit he needs him back.[7] Tyler Mane, who played him in X-Men, had hoped to reprise the role.[8] Jackman worked with Schreiber before, in the 2001 romantic comedy Kate & Leopold and described him as having a competitive streak necessary to portray Sabretooth. They "egged" each other on set to perform more and more stunts. Schreiber put on 40 lb (18 kg) of muscle for the part,[7] and described Sabretooth as the most monstrous role he ever played. As a child, he loved the Wolverine comics because of their unique "urban sensibility". Schreiber had studied to be a fight choreographer and wanted to be a dancer like Jackman, so he enjoyed working out their fight scenes.[9]
Michael James Olsen as Young Victor
Danny Huston as William Stryker: Schreiber was originally in negotiations for the part,[10] while Brian Cox, who played the character in X2, wanted to reprise the role. He believed computer-generated imagery, similar to the program applied to Patrick Stewart and Ian McKellen in the opening flashback of X-Men: The Last Stand, would allow him to appear as the younger Stryker.[11] Huston liked the complex Stryker, who "both loves and hates mutants because his son was a mutant and drove his wife to suicide. So he understands what they're going through, but despises their destructive force." He compared the character to a racehorse breeder, who rears his mutant experiments like children but abandons them when something goes wrong. His son is shown to be frozen at the Weapon X facility and the reason Stryker starts the Weapon XI program.