A college paleontology professor acquires a newly discovered specimen of a coelecanth, but while examining it, he is accidentally exposed to its blood, and finds himself periodically turning into a murderous Neanderthal man.
| Directing | Jack Arnold | Director |
| Art | Alexander Golitzen | Art Direction |
| Visual Effects | Jack Kevan | Creature Design |
| Production | Joseph Gershenson | Producer |
| Camera | Russell Metty | Director of Photography |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Writing | David Duncan | Writer |
| Editing | Ted J. Kent | Editor |
| Visual Effects | Clifford Stine | Visual Effects |
