The pilot follows the adventures of William Sebastian (Robert Culp), a former criminologist and occult expert, and his colleague, Dr. "Ham" Hamilton (Gig Young), a physician and forensic pathologist, as they visit the United Kingdom to investigate a case involving the aristocratic Cyon family.

[2] The cast includes John Hurt, James Villiers, Gordon Jackson, Ann Bell, and Majel Barrett.

As the pair are getting reacquainted, a woman claiming to be Anitra Cyon unexpectedly visits and tells Sebastian that his services are no longer required.

When they reach the Manor, they are greeted first by Sir Geoffrey Cyon, Anitra and Mitri's older brother and head of the family.

The real Anitra reiterates her reason for consulting Sebastian: due to an unknown influence, Geoffrey's behaviour has changed dramatically and he has turned Cyon Manor into a den of iniquity.

That night, the duo investigate the grounds of the Manor and discover ruins which lead to a hidden underground temple devoted to Asmodeus.

After its rejection by American television, an extended version of Spectre was released in the UK as a theatrical film with additional footage that includes nudity.

He came to believe that some unseen forces were causing a number of significant crimes, particularly after studying Charles Manson, Richard Speck, the Boston Strangler, and the Tokyo Bluebeard.

Dr. Amos "Ham" Hamilton (Gig Young) is a medical doctor who worked as staff physician and forensic pathologist at Fairview General Hospital in Boston, Massachusetts, but thirteen years ago he started a partnership with William Sebastian as criminal investigators.

Lilith (played by Gene Roddenberry's wife Majel Barrett) is Sebastian's housekeeper, a practicing witch who brews a remedy that "cures" Ham's alcoholism through aversion therapy.