The second assistant director kept the set running on seasons two and three.
Read a wide-ranging interview with Takei and get confirmation that TOS did not employ invisible stagehands.
Walter Koenig, I need you. Please come back to Toronto. Also, did you know Canadians got to see Star Trek before the Americans?
George Takei was thrilled when John Wayne cast him in The Green Berets, but that robbed Takei of the chance to pick up a Tribble with Uhura on K-7.
Except that story is not quite true.