When his brother disappears, a man visits the remote country house where he was last seen. While the host seems outwardly friendly and his niece more demonstrably so, there's a feeling of menace in the air with the overhanging legend of Lavinia Morley, the Black Witch of Greymarsh.
Unfortunately the movie Curse of the Crimson Altar is not yet available on Disney Plus.
| Directing | Vernon Sewell | Director |
| Writing | Mervyn Haisman | Screenplay |
| Writing | Henry Lincoln | Screenplay |
| Production | Louis M. Heyward | Producer |
| Production | Tony Tenser | Executive Producer |
| Writing | H.P. Lovecraft | Novel |
| Production | Gerry Levy | Associate Producer |
| Writing | Jerry Sohl | Story |
| Sound | Peter Knight | Original Music Composer |
| Camera | John Coquillon | Director of Photography |
| Editing | Howard Lanning | Editor |
| Art | Derek Barrington | Art Direction |
| Costume & Make-Up | Michael Southgate | Costume Design |
| Costume & Make-Up | Betty Blattner | Makeup Artist |
| Costume & Make-Up | Ann Fordyce | Hairdresser |
| Costume & Make-Up | Pauline Worden | Makeup Artist |