Directed by
| Virgil W. Vogel | ||
Writing Credits (in alphabetical order)
| Robert M. Fresco | ... | (uncredited) |
| Arthur C. Pierce | ... | (screenplay) |
| Arthur C. Pierce | ... | (story) |
Cast (in credits order)
 |
Barbara Wilson | ... | Diane Wilson |
| Sten Gester | ... | Erik Engström | |
| Robert Burton | ... | Dr. Frederick Wilson | |
| Bengt Blomgren | ... | Col. Robert Bottiger | |
| Åke Grönberg | ... | Dr. Henrik (as Ake Gronberg) | |
| John Carradine | ... | Narrator (voice) | |
| Gösta Prüzelius | ... | Dr. Walter Ullman (as Gosta Pruzelius) | |
| Rest of cast listed alphabetically: | |||
| Brita Borg | ... | Singer (uncredited) | |
| Steve Conte | ... | American Radio Supervisor #2 (US TV version) (uncredited) | |
| Doreen Denning | ... | Anna (uncredited) | |
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Ittla Frodi | ... | Girlfriend in Volvo (uncredited) |
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Fred Hoffman | ... | Doctor (US TV version) (uncredited) |
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Allan Johansson | ... | (uncredited) |
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G.J. Mitchell | ... | Diane's Psychiatrist (US TV version) (uncredited) |
| Chuck Niles | ... | Second Doctor (US TV version) (uncredited) | |
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Gustaf Unger | ... | Air Passenger with Dark Glasses (uncredited) |
| Katherine Victor | ... | Diane's Mother (US TV version) (uncredited) | |
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Lars Åhrén | ... | The Monster / An Alien / Tall Nightclub Soldier (uncredited) |
Produced by
| Bertil Jernberg | ... | producer |
| Gustaf Unger | ... | co-producer |
Music by
| Harry Arnold | ||
| Allan Johansson | ||
Cinematography by
| Hilding Bladh | ||
Editing by
| Shirley Cytron | ... | (as Shirley Citron) |
| Tom Rolf | ... | (as Ernst R. Rolf) |
Art Direction by
| Nils Nilsson | ||
Production Management
| David Norberg | ... | production manager |
Second Unit Director or Assistant Director
| Bengt Järrel | ... | assistant director (as Bengt Jarrel) |
Art Department
| Karl-Arne Bergman | ... | property master |
Sound Department
| Stig Flodin | ... | sound recordist |
Special Effects by
| Odert von Schoultz | ... | special effects |
Camera and Electrical Department
| Stig Hjert | ... | first assistant camera |
| Bengt Lindström | ... | camera operator (as Bengt Lindstrom) |
| Jerry Warren | ... | director of photography: added American scenes (uncredited) |
Costume and Wardrobe Department
| Nasse Johnson | ... | wardrober |
Editorial Department
| Jerry Warren | ... | editor: added American scenes |
Music Department
| Harry Arnold | ... | conductor |
| Allan Johansson | ... | conductor |
Script and Continuity Department
| Ulla Ryghe | ... | script girl (as Ulla Ryhge) |
Additional Crew
| Jerry Warren | ... | director: added American scenes / producer: added American scenes (uncredited) |
