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.
| Actor | Role |
|---|---|
 Tom BakerThe Doctor | The Doctor |
 Bernard HorsfallChancellor Goth | Chancellor Goth |
 Peter PrattThe Master | The Master |
 Llewellyn ReesThe President | The President |
 Hugh WaltersCommentator Runcible | Commentator Runcible |
 Angus MacKayCardinal Borusa | Cardinal Borusa |
 George PravdaCastellan Spandrell | Castellan Spandrell |
 Erik ChittyCo-Ordinator Engin | Co-Ordinator Engin |
| DDerek SeatonCommander Hilred | Commander Hilred |
| MMaurice QuickGold Usher | Gold Usher |
| JJohn DawsonTime Lord | Time Lord |
 Michael BiltonTime Lord | Time Lord |