Doug McClure as Jim Hill

Ann Turkel as Dr. Susan Drake

Vic Morrow as Hank Slattery

Cindy Weintraub as Carol Hill

Anthony Pena as Johnny Eagle

Denise Galik as Linda Beale

Lynn Theel as Peggy Larson

Meegan King as Jerry Potter

Breck Costin as Tommy Hill

Hoke Howell as Deke Jensen

Don Maxwell as Dickie Moore

David Strassman as Billy

Greg Travis as Mike Michaels, Radio Announcer

Linda Shayne as Sandy, Miss Salmon

Lisa Glaser as Becky

Bruce Monette as Jake Potter

Amy Barrett as Amy

Shawn Erler as John, Hill Baby

Frank Arnold as Old Man

Jo Williamson as Self on Piano

Henry T. Williams as Bass

Lyle Isom as Banjo

Jonathan Lehan as Fiddle

Rob Bottin as Humanoid (uncredited)

Kent Adamson as Humanoid Killer (uncredited)

Steve Johnson as Humanoid (uncredited)

Larry Wessel as Humanoid Killer (uncredited)