NOTE: This article is about the incarnation of Sabretooth from the X-Men film series. The mainstream version can be found here: Sabretooth (Marvel).
I'm not your friend, I'm an animal who dreamed he was a man. But the dream is over. And the beast is awake. And I will come for you because it is my nature.
Sabretooth (real name: Victor Creed) is a recurring antagonist of the X-Men film series, serving as a supporting antagonist in X-Men and the secondary antagonist turned anti-hero in X-Men Origins: Wolverine. He is Wolverine's brother and archenemy.
He was played by Tyler Mane in the first X-Men movie, who portrayed Michael Myers in the 2007 remake of Halloween and by Liev Schreiber in the prequel, who also portrayed Stu Wargle in Phantoms, Ray Donovan in the series of the same name, Ted Winter in Salt, Colonel Alexander Vosch in The 5th Wave, and voiced the Storm King in My Little Pony: The Movie and Kingpin in Spider-Man: Into the Spider-Verse.
X-Men Origin: Wolverine
In the movie X-Men Origins: Wolverine, he is Wolverine's older brother and the secondary antagonist who turned supporting protagonist and later the anti-hero of the film and was portrayed by Liev Schreiber. He and Wolverine have been together, taking care of each other and have been in every American war due to their ability of accelerating healing factor. Sabretooth's story is somewhat similar and somewhat different to Wolverine's story. They both were in the same team lead by William Stryker. The members were Agent Zero, Fred Dukes, AKA Blob Wade Wilson AKA Deadpool, John Wraith, and Chris Bradley AKA Bolt, now deceased. However in every war he slowly begin enjoying killing people. Six years after Wolverine leaves the team he begins to kill and kidnapping other mutants under the command of Stryker. He then "kills" Logan's girlfriend Kayla Silverfox in order to provoke him into accepting Styker's treatment so he can properly fight Victor. In the end Wolverine and Sabretooth team up to take down Weapon XI aka Deadpool.
Scream for me.
~ Sabretooth to Storm
While out on his own, Sabretooth became Magneto's right-hand and a member of the Brotherhood of Mutants, however he doesn't have much to say and there's no back story. All he mostly does is growl at everyone, mostly at Toad. He and Wolverine had a fight on top of the Statue of Liberty. With the powers of Cyclops and Jean Grey they blasted Sabretooth through the Statue of Liberty and fell right through a security boat.
He is confirmed to have survived the fall, but has not been seen since. A possible explanation for his failure to properly recognize Wolverine is that he had become so feral by this point that he lost his memory, though since the "Origins" film was released after "X-Men", the writers probably hadn't thought of it yet.
A young Sabretooth.
A young Sabretooth and Wolverine leave home together.