| Tom Baker | ... | Doctor Who / Narrator | |
| Lalla Ward | ... | Romana | |
| Christopher Neame | ... | Skagra | |
| Denis Carey | ... | Professor Chronotis | |
| Daniel Hill | ... | Chris Parsons | |
| Victoria Burgoyne | ... | Clare Keightley | |
| David Brierly | ... | K9 / Computer Voice (voice) (as David Brierley) | |
| Gerald Campion | ... | Porter (Wilkins) | |
| Shirley Dixon | ... | Voice of Skagra's Ship | |
| James Coombes | ... | Voice of Krargs | |
| Derek Pollitt | ... | Professor Caldera (episode 4) | |
| John Hallet | ... | Police Constable (episode 6) | |
| rest of cast listed alphabetically: | |||
| Graham Cole | ... | Krarg (uncredited) | |
| Harry Fielder | ... | Krarg Commander / Krarg 3 (uncredited) | |
| James Muir | ... | Krarg (uncredited) | |
| Lionel Sansby | ... | Krarg (uncredited) | |
| Derek Suthern | ... | Krarg (uncredited) | |
| Reg Woods | ... | Krarg (uncredited) | |
Directed by | |||
| Pennant Roberts | |||
Writing credits | ||
| Douglas Adams | (by) (original material) | |
Produced by | |||
| John Nathan-Turner | .... | producer (video release) | |
| Graham Williams | .... | producer | |
Cinematography by | |||
| Fintan Sheehan | |||
Film Editing by | |||
| Tariq Anwar | (original production) | ||
Production Design by | |||
| Victor Meredith | |||
Costume Design by | |||
| Rupert Jarvis | (original production) (as Rupert Roxburghe-Jarvis) | ||
Production Management | |||
| John Nathan-Turner | .... | unit production manager | |
| Ralph Wilton | .... | production manager | |
Costume and Wardrobe Department | |||
| Rupert Jarvis | .... | costumes: original production (as Roxburghe-Jarvis) | |
Music Department | |||
| Ron Grainer | .... | composer: theme music | |
| Dudley Simpson | .... | composer original production: uncompleted | |
Other crew | |||
| Douglas Adams | .... | script editor: original material | |
| Olivia Bazalgette | .... | assistant to director | |
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| Fiend Without a Face | Dogville | Journey to the Center of the Earth | Timeline | 2001: A Space Odyssey |
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| Full cast and crew | Company credits | External reviews |
| IMDb Adventure section | IMDb UK section |
This film, despite being incomplete (Due to a strike at the BBC I believe) really is quite excellent. The plot is compelling, and the cast is simply first class. Although the special effects are a little ropey (Not surprisng for TV sci-fi of the 1970's), that does not detract from the story in the slightest. This is partly because of the superb acting, as I mentioned earlier, but also because of the script, written by the late great Douglas Adams, of 'Hitchhiker's Guide to the Galaxy' fame. Of particular interest to fans of film will be the unfinished nature of this film. Originally intended as a 6 part serial for 'Doctor Who', it was only partially completed, and is presented here with linking naration by Tom Baker, and a booklet of the script, complete with the unfilmed scenes. For anyone seriously interested in the production of TV and film, this is a must. But this would also sit well in anyones collection as a superb example of Science Fiction.