Writer David Gerrold asked to do a voice in this episode so he could get a Screen Actors Guild card. According to Gerrold, he was not satisfied with his performance.
Author Stephen Kandel also wrote Mudd's Women (1966), I, Mudd (1967), and, here, "Mudd's Passion". He was also a writer and story editor for Mission: Impossible (1966), a series that shares the same basic concept of this story: a team of specialists brought together to handle an "impossible" mission.
This is one of two episodes that do not feature James Doohan voicing Montgomery Scott (the other being The Slaver Weapon (1973), in which the character does not appear), although Scott does appear here and Doohan did voice two other characters (Sord and Tchar).
The birdlike mechanical sentinels that launch an attack against the team of specialists were a recycled character design that was previously used to portray both the swoopers in The Infinite Vulcan (1973) and the Maravel dragons in The Eye of the Beholder (1974). New backgrounds were added for the reuse of the footage, though the actual animation remained the same.