From Cool Movie Trivia :
Do you know of an actor or actress who has starred in three seperate sets of trilogies? We are having a hell of a time coming up with any, the best we could do was Christopher Lee, for LOTR, all those Dracula movies he made and the new Star Wars trilogy (even though he didn't appear in the first installment!)
-Lee
CMT Answer:
That's a toughie. Christopher Lee is maybe one of the closest you could get for a major Hollywood actor. Another super-close one could be Harrison Ford for Indy, Star Wars, and two Jack Ryan movies (not a trilogy and he's still one flick shy). You've also got Hugo Weaving for Matrix and LOTR, but no third trilogy. Mel Gibson for Mad Max and Lethal Weapon (four flicks), no third trilogy. Mel could make a couple of Bird on a Wire sequels still.
If you were just going for starring in at least one entry in three separate trilogies, but not having to be in all three movies, then the floodgates open right up. One example would be Samuel L. Jackson- Die Hard trilogy (Part 3), Jurassic Park trilogy (Part 1), Star Wars prequels.
Our August 31st 'actors in three trilogies' question from our continues to pull in feedback. Larry wrote in with a whole whack of two-trilogy actors, including Frank Oz in Star Wars and Muppets movies, and James Earl Jones in the Tom Clancy flicks and Star Wars. He also noted: "The only one who might come close to being featured in three trilogies might be Warwick Davis. He was featured in Star Wars, Leprechaun, and Harry Potter. Of course Harry Potter 3 isn't out yet. " (Cal note: pretty close, yes, but he was only in Jedi in the original trilogy and Episode I in the prequels).
They don't kinow either.