The Doctor and his companions arrive on a spaceship headed for Earth, populated by natives of Earth from various different eras and commanded by the leaders of the Urbankan race. What are the Urbankans' intentions when they reach Earth?
| Directing | John Black | Director |
| Writing | Terence Dudley | Writer |
| Crew | Dick Mills | Special Sound Effects |
| Production | John Nathan-Turner | Producer |
| Writing | Antony Root | Script Editor |
| Sound | Roger Limb | Original Music Composer |
| Costume & Make-Up | Dorka Nieradzik | Makeup Artist |
| Sound | Alan Machin | Sound |
| Art | Tony Burrough | Production Design |
| Lighting | Don Babbage | Lighting Director |
| Editing | Rod Waldron | Editor |
| Costume & Make-Up | Colin Lavers | Costume Design |
| Visual Effects | Mickey Edwards | Visual Effects Designer |
| Visual Effects | Dave Chapman | Visual Effects |
| Production | Jean Davis | Production Assistant |
| Crew | B.H. Harry | Stunt Coordinator |
