On screen
Cast
18 credited performers
Artwork unavailable
Marshall Grauer
Dr. Kurt Leopold
Artwork unavailable
Wade Popwell
The Monster
Artwork unavailable
Paul Galloway
Sheriff Lou Krantz
Artwork unavailable
Gerald Cruse
Marine Biologist Rex
Artwork unavailable
Sanna Ringhaver
INPIT Agent Martha Walsh
Artwork unavailable
Dave Dickerson
INPIT Agent Walker Stevens
Artwork unavailable
Rich Valliere
Deputy Sheriff
Artwork unavailable
Nancy Lien
Girl Camper
Artwork unavailable
Russell Holcomb
Character not listed
Artwork unavailable
Gloria Brady
Character not listed
Artwork unavailable
Del Galloway
Character not listed
Artwork unavailable
Hal Nearhoof
Character not listed
Artwork unavailable
Jim Merrill
Character not listed
Artwork unavailable
Elizabeth Barton
Girl on Porch
Artwork unavailable
Bob Knowles
Character not listed
Artwork unavailable
Carol Thompson
Character not listed
Artwork unavailable
Jack Weatherford
Character not listed
Artwork unavailable
Doug Thomas
Reporter