The relatives of a recently deceased man gather at his eerie mansion but before his will can be read, they start being murdered one by one.
Unfortunately the movie Castle of Evil is not yet available on HBO Max.
| Directing | Francis D. Lyon | Director |
| Writing | Charles A. Wallace | Screenplay |
| Production | Earle Lyon | Producer |
| Sound | Paul Dunlap | Original Music Composer |
| Camera | Brick Marquard | Director of Photography |
| Art | Paul Sylos | Art Direction |
| Art | Harry Reif | Set Decoration |
| Production | Kerwin Coughlin | Casting |
| Production | Jasper Russel | Casting |
| Production | Fred Jordan | Executive Producer |
| Production | Wendell E. Niles Jr. | Associate Producer |
| Editing | Robert S. Eisen | Supervising Editor |
| Costume & Make-Up | Robert Dawn | Makeup Artist |
| Costume & Make-Up | Linda Trainoff | Hairstylist |
| Production | Joe Wonder | Production Manager |
| Crew | Roger George | Special Effects |
