 Barbara WilsonDiane Wilson | Diane Wilson |
 Sten GesterErik Engström | Erik Engström |
 Robert BurtonDr. Frederick Wilson | Dr. Frederick Wilson |
 Bengt BlomgrenCol. Robert Bottiger | Col. Robert Bottiger |
 Åke GrönbergDr. Henrik | Dr. Henrik |
 John CarradineNarrator (US Re-Edit) | Narrator (US Re-Edit) |
 Gösta PrüzeliusDr. Walter Ullman | Dr. Walter Ullman |
 Brita BorgSinger (uncredited) | Singer (uncredited) |
 Doreen DenningAnna (uncredited) | Anna (uncredited) |
 Ittla FrodiGirlfriend in Volvo (uncredited) | Girlfriend in Volvo (uncredited) |
| LLars ÅhrénThe Monster (uncredited) | The Monster (uncredited) |
 Steve ConteAmerican Radio Supervisor #2 (US TV version) (uncredited) | American Radio Supervisor #2 (US TV version) (uncredited) |
| FFred HoffmanDoctor (US TV version) (uncredited) | Doctor (US TV version) (uncredited) |
 Allan Johansson(uncredited) | (uncredited) |
| GG.J. MitchellDiane's Psychiatrist (US TV version) (uncredited) | Diane's Psychiatrist (US TV version) (uncredited) |
| CChuck NilesSecond Doctor (US TV version) (uncredited) | Second Doctor (US TV version) (uncredited) |
| GGustaf UngerAir Passenger with Dark Glasses (uncredited) | Air Passenger with Dark Glasses (uncredited) |
 Katherine VictorDiane's Mother (US TV version) (uncredited) | Diane's Mother (US TV version) (uncredited) |
