Leonard Nimoy has remained as Spock ever since Star Trek began. There was never a Spock before Nimoy. Although Nimoy has always played Spock, before production Deforest Kelly (Doctor McCoy) was cast as Spock but was later considered better suited to play Doctor McCoy.
Also, in the May 2009 movie; Nimoy will only be playing the older Spock since he is turning 78 on March 26th, 2009. Zachary Quinto will be playing the younger Spock in this movie.
(If you do not understand how there can be a younger && an older Spock in the same movie, please ask a question about it!)
from http://en.wikipedia.org/wiki/Spock
In The Making of Star Trek (1968), Roddenberry noted that he had been looking for an alien-sounding name, and didn't know until later of Dr. Benjamin Spock, the renowned child psychologist.[12] In the initial, rejected pilot, "The Cage" (1964), Spock is greenish yellow and from the planet Vulcan. Roddenberry cast Nimoy because he knew him from his guest appearance in The Lieutenant, which Roddenberry had created and sold as a pilot; after Roddenberry saw Nimoy's thin face and sharp features, no other actors were considered.[13] Had Nimoy turned down the role, Roddenberry would have approached Martin Landau.[14] In a 1980s interview, DeForest Kelley stated Roddenberry offered him the role of Spock before production began on "The Cage".[15]
Deforrest Kelley; who was instead cast as Dr. McCoy
In the Star Trek (2009) movie, Jacob Kogan played the child Spock.
T'Pring was the name of Mr. Spock's fiance in Star Trek: The Original Series.
Commander
Spock holds an A7 classification.
Spock originally appeared on Star Trek, but has made cameos on other Star Trek spin-offs.
Young spock in the Star Trek movie is played by Jacob Kogan.
In the Star Trek (2009) movie, Jacob Kogan played the child Spock.
T'Pring was the name of Mr. Spock's fiance in Star Trek: The Original Series.
Star Trek: The Search for Spock
Spock. Period.
Spock.
Mr. Spock's mother was a teacher.
The TV show in which there is a Vulcan named Spock is Star Trek. But not just any Star Trek! Star Trek: The Original Series (aka, ST-TOS). Spock is also pictured in various Star Trek movies, however, I believe your question was asking about TV shows. ;P. Spock also appeared in episodes of Star Trek: The Next Generation (ST:TNG) as leader of the Romulan reunion movement.
Vulcan.
Spock .