Concerning the question of why "Spectre" did not become a series , i would like to give my 2 cents. the 1970's saw a lot of supernatural/sci-fi themed TV movies which were obviously intended as series pilots . NBC had this film , and also "The Norliss Tapes" with Roy Thinnes. "The Questor Tapes" was a Gene Roddenberry concept. CBS had another of Gene's creations,"Genesis II". This was later redone as "Planet Earth" on ABC , which also aired "Baffled!" with Star Trek's Leonard Nimoy as a clairvoyant race car driver(!). Not a one made it to series. I believe it was a concern about not having enough plots to sustain a weekly series , expensive location shooting and f/x , and a continuing lack of support for the genre led to their demise. The failure of ABC's "Night Stalker" and "The Sixth Sense" also didn't help. In addition , "Star Trek" itself was still at that time considered a relative failure despite the beginnings of its resurgence. I think a possible answer may have been to include a series like "Spectre" as part of a rotating "Mystery Movie" type of show along with some more standard detective /thriller series. with a star like Robert Culp , older viewers may have given it a chance , along with younger viewers who were the main fans of the genre.
