Charged with genocide by the treacherous Valeyard at his trial, the Doctor receives help from an unlikely source to turn the tide of the High Council's rulings in his favour and reveal the Valeyard as a wrongdoer: the Master. For the Valeyard's own crimes are so atrocious, even the Doctor's archenemy will help him to ensure that the villain won't see the light of day again. Cornered, the Valeyard flees to the Matrix, where he can be the Doctor's judge, jury and executioner...
Colin Baker
as The Doctor
Bonnie Langford
as Mel Bush
Michael Jayston
as The Valeyard
Lynda Bellingham
as The Inquisitor
Anthony Ainley
as The Master
Tony Selby
as Sabalom Glitz
Geoffrey Hughes
as Popplewick
James Bree
as Keeper of the Matrix
