| Jon Pertwee | ... | Dr. Who | |
| Patrick Troughton | ... | Dr. Who | |
| William Hartnell | ... | Dr. Who | |
| Katy Manning | ... | Jo Grant | |
| Nicholas Courtney | ... | Brigadier Lethbridge Stewart | |
| John Levene | ... | Sergeant Benton | |
| Rex Robinson | ... | Dr. Tyler | |
| Stephen Thorne | ... | Omega | |
| Roy Purcell | ... | President of the Council | |
| Clyde Pollitt | ... | Chancellor | |
| Graham Leaman | ... | Time Lord | |
| Laurie Webb | ... | Mr. Ollis | |
| Denys Palmer | ... | Corporal Palmer |
| Episode Crew |
Directed by | |||
| Lennie Mayne | |||
Writing credits | ||
| Bob Baker | (written by) & | |
| Dave Martin | (written by) | |
Produced by | |||
| Barry Letts | .... | producer | |
Production Design by | |||
| Roger Liminton | |||
Sound Department | |||
| Dick Mills | .... | special sound | |
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 |