1966 - The Star Dream

"The Star Dream" is the title of a documentary, made in 1974/1975. 
One of the items shown is this interview originally taped in 1966. 

Summary interview: 
It's the story how he got into show-business. How earlier acting experiences let him to get the part of Mr. Spock. He arrives early on the set, as it takes one hour and half to do the make-up.