| Jon Pertwee | ... | Dr. Who | |
| Katy Manning | ... | Jo Grant | |
| Tenniel Evans | ... | Major Daly | |
| Ian Marter | ... | John Andrews | |
| Jenny McCracken | ... | Claire Daly | |
| Leslie Dwyer | ... | Vorg | |
| Cheryl Hall | ... | Shirna | |
| Peter Halliday | ... | Pletrac | |
| Michael Wisher | ... | Kalik | |
| Terence Lodge | ... | Orum | |
| rest of cast listed alphabetically: | |||
| Stuart Fell | ... | Functionary (uncredited) | |
| Mohammad Shamsi | ... | Walk-On (uncredited) | |
| Episode Crew |
Directed by | |||
| Barry Letts | |||
Writing credits | ||
| Robert Holmes | (written by) | |
Produced by | |||
| Barry Letts | .... | producer (uncredited) | |
Production Design by | |||
| Roger Liminton | |||
Costume Design by | |||
| James Acheson | |||
Makeup Department | |||
| Angela Seyfang | .... | makeup artist | |
Sound Department | |||
| Brian Hodgson | .... | special sound | |
| Gordon Mackie | .... | sound | |
Visual Effects by | |||
| John Horton | .... | visual effects designer | |
Camera and Electrical Department | |||
| Clive Thomas | .... | lighting technician | |
Music Department | |||
| Ron Grainer | .... | composer: title music | |
| Dudley Simpson | .... | composer: incidental music | |
Other crew | |||
| Terrance Dicks | .... | script editor | |
| Main series | Episode guide | Full cast and crew |
| Company credits | IMDb TV section | IMDb Adventure section |
| IMDb UK section | Add this title to MyMovies |