Humanoides del abismo: Reparto
Doug McClure
Jim Hill
Ann Turkel
Dr. Susan Drake
Vic Morrow
Hank Slattery
Cindy Weintraub
Carol Hill
Anthony Pena
Johnny Eagle
Denise Galik
Linda Beale
Lynn Theel
Peggy Larson
Meegan King
Jerry Potter
Breck Costin
Tommy Hill
Hoke Howell
Deke Jensen
Don Maxwell
Dickie Moore
David Strassman
Billy
Greg Travis
Mike Michaels, Radio Announcer
Linda Shayne
Sandy, Miss Salmon
Lisa Glaser
Becky
Bruce Monette
Jake Potter
Amy Barrett
Amy
Shawn Erler
John, Hill Baby
Frank Arnold
Old Man
Jo Williamson
Self on Piano
Henry T. Williams
Bass
Lyle Isom
Banjo
Jonathan Lehan
Fiddle
Rob Bottin
Humanoid (uncredited)
Kent Adamson
Humanoid Killer (uncredited)
Steve Johnson
Humanoid (uncredited)
Larry Wessel
Humanoid Killer (uncredited)