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