One of the problems of doing a prequel is that the filmmakers are usually forced to get to a point that everyone knows is coming.
Take for example X-Men Origins: Wolverine, which tells the early story of the hairy Marvel superhero. What we know from the other three films is that the mysterious Logan doesn't remember much. Things like why he has claws of indestructible metal that can come out his fists at will or why he can heal no matter how badly his body is battered.
The new film, directed by Gavin Hood (Tsotsi, Rendition), gives us a back story that begins in 1845, when the young James Logan, in a fit of rage, draws his first blood. He also finds out he has a brother with similar powers named Victor Creed. The two grow up to become fighters — the Civil War, World War I and World War II — but eventually have a falling-out during the Vietnam War, when Victor becomes a little too bloodthirsty, and they go their separate ways.
Hugh Jackman reprises his role as Wolverine, and Liev Schreiber plays Victor. The two inevitably will cross claws, but not before Logan undergoes a body transplant and becomes entangled in a nasty government conspiracy. The film is mostly about big CGI battles. It's hardly memorable, which might be a better explanation for why Wolverine has amnesia than the one the film comes up with.
X-Men Origins: Wolverine retails for $29.99 and $39.99 on Blu-ray.