Well, unfortunately I havent seen the tv series of Star Trek, however I believe he made an appearance in Star Trek the movie (the version with chris pine and zachary quinto) as future Spock, which was a brilliant film :)
Live long and prosper.
Any Star Trek fans out there? I'm wondering what the best episode to watch in honor of Leonard Nimoy is.
I think the movies were the best to get out of Star Trek! So, I would go with : Star Trek III The Search for Spock! Best of the bunch!
Try season 3 episode 2, The Enterprise Incident. ;] I think it's in Spok's perspective.
RIP Leonard