Sontaran Field Major Styre is conducting experiments on the survivors of future Earth in preparation of a full-scale Sontaran invasion of the planet. Can the Doctor defeat Styre and save the world?
| Directing | Rodney Bennett | Director |
| Writing | Dave Martin | Writer |
| Writing | Bob Baker | Writer |
| Sound | Dudley Simpson | Original Music Composer |
| Production | Philip Hinchcliffe | Producer |
| Writing | Robert Holmes | Script Editor |
| Production | Marion McDougall | Production Assistant |
| Crew | Dick Mills | Special Sound Effects |
| Visual Effects | John Friedlander | Visual Effects |
| Visual Effects | Tony Oxley | Visual Effects |
| Costume & Make-Up | Barbara Kidd | Costume Design |
| Costume & Make-Up | Sylvia James | Makeup Artist |
| Lighting | Tommy Thomas | Lighting Director |
| Sound | Vic Godrich | Sound |
| Art | Roger Murray-Leach | Production Design |
| Crew | Terry Walsh | Fight Choreographer |
