This mindless science fiction film has three marine biologists, Morrison, Nagle and Vella, carrying out desperate experiments in the Florida Everglades. Vella, badly disfigured from a previous accident, is secretly testing jellyfish in his underground lab, using Hawkin's collegiate
daughter's friends for his tests. Naturally, he falls in love with the girl, but has transformed himself into a half-man, half-fish monster. For some bizarre reason, Neil Sedaka appears singing a tune.