In this dark comedy, a Yankee goes to visit a family of British eccentrics to ask for the hand of one of their daughters in marriage. He soon finds himself in the midst of a really odd family. One of them talks like Bela Lugosi, another believes herself to be a vampire, while a third is locked away in a padded cell. Another family member is thrilled when he finally invents a horseless carriage (50 years after Ford), and the family grandfather is found reading Playboy just before he dies. Trouble begins when members of the family begin to be mysteriously murdered. The American suitor must then discover which member of the strange family is in line to inherit the family fortune.
Unfortunately the movie The Horror of It All is not yet available on HBO Max.
| Production | Margia Dean | Producer |
| Directing | Terence Fisher | Director |
| Production | Robert L. Lippert | Executive Producer |
| Writing | Ray Russell | Screenplay |
| Sound | Douglas Gamley | Original Music Composer |
| Directing | Renée Glynne | Continuity |
| Production | Maureen Newman | Production Accountant |
| Costume & Make-Up | Jean Fairlie | Wardrobe Supervisor |
| Costume & Make-Up | Daphne Vollmer | Hairstylist |
| Sound | George Stephenson | Sound Recordist |
| Art | Harry White | Art Direction |
| Directing | Frank Nesbitt | Assistant Director |
| Camera | Len Harris | Camera Operator |
| Sound | Philip Martell | Conductor |
| Production | Clifford Parkes | Production Manager |
| Editing | Robert Winter | Editor |
| Costume & Make-Up | Bill Lodge | Makeup Artist |
| Production | Barbara Allen | Production Secretary |
| Camera | Arthur Lavis | Director of Photography |
| Editing | Clive Smith | Assistant Editor |
