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 |
| Costume & Make-Up | Dorka Nieradzik | Makeup Artist |
| Writing | Antony Root | Script Editor |
| Sound | Alan Machin | Sound |
| Costume & Make-Up | Colin Lavers | Costume Design |
| Editing | Rod Waldron | Editor |
| Crew | Dick Mills | Special Sound Effects |
| Production | John Nathan-Turner | Producer |
| Sound | Roger Limb | Original Music Composer |
| Art | Tony Burrough | Production Design |
| Lighting | Don Babbage | Lighting Director |
| Crew | B.H. Harry | Stunt Coordinator |
| Visual Effects | Dave Chapman | Visual Effects |
| Production | Jean Davis | Production Assistant |
| Visual Effects | Mickey Edwards | Visual Effects Designer |
