Time itself is in peril! The Time Lords and UNIT find themselves besieged by a mythic figure from the Time Lords' past hell-bent on destruction. The only way to defeat him is to break the First Law of Time and let the Doctor help himself — literally...
| Directing | Lennie Mayne | Director |
| Writing | Dave Martin | Writer |
| Writing | Bob Baker | Writer |
| Production | Barry Letts | Producer |
| Sound | Dudley Simpson | Original Music Composer |
| Costume & Make-Up | James Acheson | Costume Design |
| Costume & Make-Up | Ann Rayment | Makeup Artist |
| Camera | John Baker | Camera Operator |
| Crew | Dick Mills | Special Sound Effects |
| Editing | Jim Walker | Editor |
| Art | Roger Liminton | Production Design |
| Sound | Derek Miller-Timmins | Sound |
| Visual Effects | Michaeljohn Harris | Visual Effects Designer |
| Production | David Tilley | Production Assistant |
