Leonard Nimoy as Spock in the original Star Trek series
(1966-1969).

In April 2010, Leonard Nimoy announced his retirement from
playing the Star Trek character Spock. His retirement has not
included voice acting.

The ABC-TV medical drama Marcus Welby, M.D. starred Robert Young
and aired from September 23, 1969, to July 29, 1976. The pilot of the
series titled A Matter of Humanities, aired as an ABC Movie of the Week
on Wednesday, March 26, 1969.