Captain Kirk, Spock
The orignal Star Trek is definately my favorite Trek. I watched an episode the other night where the crew, upon encountering a strange new planet, met up with a man claiming to be Abraham Lincoln! There was also one episode where they visited a world that had been taken over by Nazis!
I just love those bizarre setups they often opened the show with, stuff that makes you say "Huh?!" It really makes for a fun mystery and keeps you hanging on. On top of that, the cast was great, especially Leonard Nimoy - Spock's usual subdued demeanor made his little accidental slips of emotion especially funny.
Anyway, Shatner and Nimoy went on to do some pretty odd things. Shatner singing "Rocket Man" was one thing, but I especially love Nimoy's "The Ballad of Bilbo Baggins"...