Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.
Unfortunately the movie The Devil Bat is not yet available on HBO Max.
| Directing | Jean Yarbrough | Director |
| Writing | John T. Neville | Screenplay |
| Writing | George Bricker | Original Story |
| Production | Guy V. Thayer Jr. | Associate Producer |
| Camera | Arthur Martinelli | Director of Photography |
| Editing | Holbrook N. Todd | Editor |
| Art | Paul Palmentola | Art Direction |
| Production | Melville De Lay | Production Manager |
| Production | Jack Gallagher | Producer |
