Curse of the Crimson altar is a 1968 British horror film directed by Vernon Sewell, starring Christopher Lee, Boris Karloff, Barbara Steele and Mark Eden. The film was produced by Louis M. Hayward for Thigon British Film Studios. The film was edited and released as a crimson worship in the United States. The play is based on H.P.Lovecraft 's short story Dream of the Witch House (unapproved) by Mervyn Heisman and Henry Lincoln, the screenwriters of Dr. Who. The film also shows the last appearance of the horror heavyweight Karlov. Antique dealer Robert Manning (Garden of Eden) looks for his brother, who was the last to visit a remote house in Greymars, their family's ancestral town. In the evening, he found a party in progress, so he was invited to live next to the owner's niece Wetherell. His sleep was restless, and strange sacrificial dreams disturbed him. Molly (Li), the owner of the house, inquired about his brother and assured him that the man was not there. Manning's suspicions were caused by nightmarish hallucinations. Mysterious.