Marshall Thompson as Dr. Cliff Mitchell

John Loder as Major Anderson

Henry Oscar as John Manning

John Stuart as Dr. Warren

Anne Aubrey as Jill Warren

Magda Miller as Ruth

Murray Kash as Waldo

Michael Mellinger as Tony Norwood

Robert MacKenzie as Dale

Tom Bowman as Charles

Peter Elliott as Syms

Bernard Archard as Inspector

Shirley Thieman as Shiela