Margaret Leighton was fatally ill with multiple sclerosis when this episode was filmed. Appearing to be sitting on a throne, she was actually in a wheelchair. She filmed her scenes in two days, and was heard to remark to director Ray Austin "You'd better get this shot, because I'm not going to last long.'
This episode was paired with Black Sun (1975) for the TV movie/video release titled Journey Through the Black Sun (1982).
Director Ray Austin had worked with Martin Landau previously. Austin, a former stunt man, had been Landau's stunt double on North by Northwest (1959), and one of the stunt coordinators on Cleopatra (1963), which Landau had been in the cast (although three-quarters of his performance ended up on the cutting room floor; the original cut of the film long enough to have been a mini-series).
This was the first appearance of the red and white striped Rescue Eagle (these shots are actually taken from Earthbound (1975), which was the fifth episode shot).
While this was the third episode broadcast, it was the thirteenth to be filmed (August 27th to September 6th, 1974), written by the husband-and-wife team of Anthony Terpiloff and Elizabeth Barrows (as was the subsequent Death's Other Dominion (1975)).