scotty
He was in WW2 missing a finger from from that war. His son is in the last star trek movie.
Mel Metcalfe was not a cast member; he was a crew member. He was a re-recording mixer for Star Trek II: The Wrath of Khan and Star Trek IV: The Voyage Home.
Actually, he didn't lose his finger in the series. It was an accident. :( The actor is actually missing a finger. It's pretty impressive, though, how they 'hide' it from the camera. Next time you watch the original series, watch his hand. It's always curled so that you can't see his missing finger.
Leonard Nimoy
I'm a Tribble.
Pavel Chekov
In order Star Trek: The Motion Picture Star Trek: The Wrath of Kahn Star Trek: The Search for Spock Star Trek: The Voyage Home Star Trek: The Final Frontier Star Trek: The Undiscovered Country Star Trek: Generations Star Trek: First Contact Star Trek: Insurrection Star Trek: Nemesis Star Trek (plain and simple Star Trek)
Star Trek: The animated Series (1973) Star Trek: The Next Generation (1987) Star Trek: Deep Space Nine (1993) Star Trek: Voyager (1995) Star Trek: Enterprise (2001)
In Theory
Leonard Nimoy .
Star Trek: The Original Series Star Trek: The Animated Series Star Trek: The Next Generation Star Trek: Deep Space Nine Star Trek: Voyager Star Trek: Enterprise Star Trek: Bridge Commander (TV Series)
Star Trek: the Motion Picture Star Trek: The Wrath of Khan Star Trek: The Search For Spock Star Trek: The Voyage Home Star Trek: the Final Frontier Star Trek: The Undiscovered Country Star Trek: The Captain's Summit That's all the movies in order.