Leonard Nimoy appeared in the science-fiction TV series Zombies of the Stratosphere (1952) before “Star Trek” (NBC, 1966-69).
Nimoy played Narab, a Martian.
See also:
- On What TV Series Did William Shatner and Leonard Nimoy Work Together Before “Star Trek” (NBC, 1966-69)?
- On What TV Series Was William Shatner a Regular Before “Star Trek” (NBC, 1966-69)?
- Who Played Spock’s Love Interest Leila on the “Star Trek” (NBC, 1966-69) Episode Called “This Side of Paradise”?
- What Were the First Names of Scott, Chekov, and McCoy on “Star Trek” (NBC, 1966-69)?
- What Is the Full Name of Khan, the Superhuman “Star Trek” Villain?

One Comment
“Zombies of the Stratosphere” were short movie installments shown as 1st features in movie theatres during the 50′s. If you mean what other sci-fi TV series he appeared in, try “Outer Limits” or “Twilight Zone”