Directed by Don Barton Arnold Stevens Written by Ron Kivett   Lee O. Larew   Don Barton   Arnold Stevens   Cast Marshall Grauer ... Dr. Kurt Leopold Wade Popwell ... The Monster Paul Galloway ... Sheriff Lou Krantz Gerald Cruse ... Marine Biologist Rex Sanna Ringhaver ... INPIT Agent Martha Walsh Dave Dickerson ... INPIT Agent Walker Stevens Rich Valliere ... Deputy Sheriff (as Archie Valliere) Nancy Lien ... Girl Camper Russell Holcomb   Gloria Brady   Del Galloway   Hal Nearhoof   Jim Merrill ... Boy on porch Elizabeth Barton ... Girl on porch Bob Knowles   Carol Thompson   Jack Weatherford   Doug Thomas ... Reporter Uncredited Cast Frank Crowell   Produced by Don Barton   Robert M. Smith Jr.   Dick Stratton   Sol Fried   Original Music by Jamie DeFrates Barry Hodgin

Additional Info Premiere: January 1971 DVD Release: February 21, 2012 Blu-ray Release: February 21, 2012 Country: Distributor: Film Chest Websites: Alternate Titles Attack Of The Swamp Creatures Blood Waters Of Dr. Z Hydra Legend Of The Zaat Monster Production Companies Barton Films Distributors Aquarius Releasing   (1971) (USA) (theatrical) Capital Productions   (1975) (USA) (theatrical) (re-titled re-release, as 'The Blood Waters of Dr. Z') Cultra   (2011) (USA) (Blu-ray) (DVD) Film Chest Media Group   (2011) (USA) (Blu-ray) (DVD) (distributed by) Rating Stats Overall Rating 2.2 / 10 Our Rating -- / 10 Your Friends -- / 10 Male Users -- / 10 Female Users -- / 10 Site Ranking #5,664 / 20,725 Site Ranking #5,660 Boogeyman 3 (2008) #5,661 Strange But True (2019) #5,662 Ten Little Indians (1965) #5,663 Alone In The Dark 2 (2008) #5,664 Zaat (1971) #5,665 Shock Treatment (1981) #5,666 The Pit And The Pendulum (1991) #5,667 Boo 2! A Madea Halloween (2017) #5,668 Boo (2005)