Summoned back to Gallifrey, the Doctor is framed for the assassination of the Time Lord President. To prove his innocence, he must stand for election himself, uncover the traitor in the Time Lord High Council, fight a hooded killer in a nightmare cyberspace world of his enemy's devising and battle against an old foe now out to destroy the Time Lords: The Master.
| Directing | David Maloney | Director |
| Writing | Robert Holmes | Writer |
| Production | Philip Hinchcliffe | Producer |
| Writing | Robert Holmes | Script Editor |
| Sound | Dudley Simpson | Original Music Composer |
| Costume & Make-Up | James Acheson | Costume Design |
| Costume & Make-Up | Joan Ellacott | Costume Design |
| Camera | Fred Hamilton | Camera Operator |
| Editing | Ian McKendrick | Editor |
| Sound | Graham Bedwell | Sound |
| Crew | Dick Mills | Special Sound Effects |
| Lighting | Brian Clemett | Lighting Director |
| Sound | Clive Gifford | Sound |
| Costume & Make-Up | Jean Williams | Makeup Artist |
| Crew | Terry Walsh | Stunt Coordinator |
| Crew | Terry Walsh | Stunt Double |
| Art | Roger Murray-Leach | Production Design |
| Production | Nicholas John | Production Assistant |
| Visual Effects | Peter Day | Visual Effects Designer |
| Visual Effects | Len Hutton | Visual Effects Designer |
