From the dark of everlasting damnation comes evil - to walk among the living!

An occult criminologist investigates a businessman who dabbles in the black arts while trying to survive against a powerful demon and an evil cult.

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Main Cast: Robert Culp, Gig Young, John Hurt, Gordon Jackson, Ann Bell, James Villiers, Majel Barrett, Jenny Runacre, Angela Grant, Penny Irving

Director: Clive Donner

Writers: Gene Roddenberry, Samuel A. Peeples

Editor: Peter Tanner

Cinematographer: Arthur Ibbetson

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