Marshall GrauerDr. Kurt Leopold Paul GallowaySheriff Lou Krantz / Unit Manager Gerald CruseMarine Biologist Rex Sanna RinghaverINPIT Agent Martha Walsh Dave DickersonINPIT Agent Walker Stevens Rich ValliereDeputy Sheriff Elizabeth BartonGirl on Porch Don BartonRegie / Drehbuch / Produzent Dick StrattonProduktionspartner Robert M. Smith Jr.Produktionspartner Jack McGowanDirector Of Photography Lee J. O'DonnellMakeup Artist George J. YarbroughSchnitt Paul GallowaySheriff Lou Krantz / Unit Manager Martha FillyawCreature Design Les LancasterCreature Design Ron KivettCreature Design / Original Story Lee O. LarewOriginal Story 