It took a few episodes to iron out the characters of both Mr. Spock and Mr. Data. Spock was rather emotional in 'The Menagerie' and Data not only had some minor emotions, he had a magnificent command of contractions.
Moments like that scene of Spock fighting emotions in "The Naked Time" was one of those wonderful examples of why Star Trek made a lasting connection to generations of fans.
The evolution of Spock also involved makeup. There's no Spock as distinctive as Spock in the replacement pilot episode, "Where No Man Has Gone Before". Here's the scene where both Spock and Kirk know that Gary Mitchell will become powerful enough to kill everyone on the Enterprise - unless they kill him now,
while they still can!



























