Darth Vader is interesting for that reason, actually. He must have been one of the first on-screen, live-action characters to be played by so many different people IN THE SAME FILM (ROTJ). I mean, you've got two actors straight away, with David Prowse and James Earl Jones. Then Sebastian Shaw. Now we've had Hayden in the suit as well (which still makes me laugh SO hard!!). Have there been any others I've missed?!