David Love as Derek

Dawn Bender as Betty Morgan

Harvey B. Dunn as Gramps Morgan

Bryan Grant as Thor

Tom Graeff as Joe Rogers

King Moody as Spacecraft Captain

Helen Sage as Nurse Morse

Frederick Welch as Dr. C.R. Brandt, MD

Carl Dickensen as Gas Station Attendant

Sonia Torgeson as Alice Woodward

Billy Bridges as Driver picking up Thor

James Conklin as Professor Simpson

Gene Sterling as The Alien Leader

Ralph Lowe as Moreal, Spaceship Crew

Bill DeLand as Saul, Spaceship Crew

Ross Evans as School Janitor