Barbara Wilson

Diane Wilson

Sten Gester

Erik Engström

Robert Burton

Dr. Frederick Wilson

Bengt Blomgren

Col. Robert Bottiger

Åke Grönberg

Dr. Henrik

John Carradine

Narrator

Gösta Prüzelius

Dr. Walter Ullman

Brita Borg

Singer (uncredited)

Doreen Denning

Anna (uncredited)

Ittla Frodi

Girlfriend in Volvo (uncredited)

Lars Åhrén

The Monster (uncredited)

Steve Conte

American Radio Supervisor #2 (US TV version) (uncredited)

Fred Hoffman

Doctor (US TV version) (uncredited)

Allan Johansson

(uncredited)

G.J. Mitchell

Diane's Psychiatrist (US TV version) (uncredited)

Chuck Niles

Second Doctor (US TV version) (uncredited)

Gustaf Unger

Air Passenger with Dark Glasses (uncredited)

Katherine Victor

Diane's Mother (US TV version) (uncredited)