An old lighthouse keeper who lives with his daughter secretly keeps a prehistoric fish-man by feeding it scraps and fish. One day he misses the feeding and all hell breaks loose.
| Actor | Role |
|---|---|
 Les TremayneDr. Sam Jorgenson | Dr. Sam Jorgenson |
 Forrest LewisConstable George Matson | Constable George Matson |
 John HarmonSturges, the Lighthouse Keeper | Sturges, the Lighthouse Keeper |
 Frank ArvidsonKochek, the Storekeeper | Kochek, the Storekeeper |
 Jeanne CarmenLucille Sturges | Lucille Sturges |
 Don SullivanFred | Fred |
 Pete DunnEddie / The Monster | Eddie / The Monster |
| JJoseph La CavaMike | Mike |
| WWayne BerwickLittle Jimmy | Little Jimmy |