So is Sabretooth (the guy who looked like a lion in the first Xmen film) really Wolverine's brother like it says in Xmen Origins: Wolverine, or did they just make that story up for the sake of the film?
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They made it up for the film. In the comics they are rivals, and did work together at various points in the past, but no blood relation. Interesting note: Sabretooth makes a point to show up on Wolverine's birthday each year with the goal of killing him.