Theo Marcuse
Theodore Carroll "Theo" Marcuse  was the actor who portrayed Korob in the  second season episode . Marcuse filmed his scenes between Friday  and Wednesday  at Desilu Stage 8.

Marcuse began his television career in 1950, and a movie career five years later. Possessed of an expressive face and able to affect a sinister mien, he worked steadily from then until his death just over one month after his appearance on Star Trek. He died in a road accident in Hollywood. His last residence was in San Francisco, California.

Among his many television credits, Marcuse played one of The Riddler's, played by Frank Gorshin, henchmen in two 1966 episodes of Batman, which also guest-starred Sherry Jackson. The same year he appeared in an episode of The Time Tunnel, starring James Darren, Lee Meriwether, and Whit Bissell. Also in 1966, he guest-starred with Sally Kellerman in an episode of I Spy and appeared in two episodes of The Twilight Zone, including the classic "To Serve Man", which featured Dave Armstrong, Joseph Ruskin, and James Wellman. In films, he appeared in Elvis Presley's Harum Scarum (1965), with Michael Ansara and directed by Gene Nelson.

Marcuse served as a lieutenant in the  during World War II. He was a submarine officer who had been awarded the Silver Star Medal for valor in combat.

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