Finding the fourth segment of the Key to Time was simple enough, but holding onto it may be another matter. The Doctor and Romana find themselves embroiled in the political games of the planet Tara, where doubles, android or otherwise, complicate the coronation of Prince Reynart.
| Directing | Michael Hayes | Director |
| Writing | David Fisher | Writer |
| Production | Graham Williams | Producer |
| Writing | Anthony Read | Script Editor |
| Sound | Dudley Simpson | Original Music Composer |
