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 BartonRegisör / Screenplay / Producent Dick StrattonAssociate Producer Robert M. Smith Jr.Associate Producer Jack McGowanDirector Of Photography Lee J. O'DonnellMakeup Artist George J. YarbroughEditor Jamie DeFratesOriginalmusikkompositör Barry HodginOriginalmusikkompositör Paul GallowaySheriff Lou Krantz / Unit Manager Ron KivettCreature Design / Original Story Les LancasterCreature Design Martha FillyawCreature Design Lee O. LarewOriginal Story 