Doctor Who The Trial of a Time Lord: Part Four (Season 23, Episode 4)
TV-G
TV Episode | 24 min | Adventure, Drama, Family

Primary photo for The Trial of a Time Lord: Part Four

Doctor Who

The Trial of a Time Lord: Part Four (Season 23, Episode 4)

TV-G

TV Episode | 24 min | Adventure, Drama, Family

All those on Ravolox are in exponentially greater peril than anyone can comprehend. If anything in the entire universe is to survive, it may come down to the Doctor arguing against machine logic over the value of life.

Director

Nicholas Mallett

Writer

Robert Holmes (written by)

Producer

John Nathan-Turner

Production Designer

John Anderson

See all filmmakers & crew (27)

Edit Released

Updated Sep 27, 1986

Release date

Sep 27, 1986 (United Kingdom)

Awards

Series awards

5 wins & 2 nominations

Contacts

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Cast	+ Add Cast
16 cast members

Name	Known for
Colin Baker The Doctor The Doctor See fewer	Doctor Who (1963)
Nicola Bryant Peri Peri See fewer	Doctor Who (1963)
Michael Jayston The Valeyard The Valeyard See fewer	Nicholas and Alexandra (1971)
Lynda Bellingham The Inquisitor The Inquisitor See fewer	The Romanovs: An Imperial Family (2000)
Joan Sims Katryca Katryca See fewer	Carry on Up the Khyber (1968)
Tony Selby Glitz Glitz See fewer	Burnside (2000)
Roger Brierley Drathro (voice) Drathro (voice) See fewer	About a Boy (2002)
Tom Chadbon Merdeen Merdeen See fewer	Casino Royale (2006)
David Rodigan Broken Tooth Broken Tooth See fewer	The Adventures of Sherlock Holmes (1984)
Glen Murphy Dibber Dibber See fewer	London's Burning (1988)
Adam Blackwood Balazar Balazar See fewer	007: Agent Under Fire (2001)
Billy McColl Humker Humker See fewer	Death Defying Acts (2007)
Sion Tudor Owen Tandrell Tandrell See fewer	Submarine (2010)
Timothy Walker Grell Grell See fewer	Four Weddings and a Funeral (1994)
Robert Goodman Crew member (uncredited) Crew member (uncredited) See fewer	Those About to Die (2024)
Paul McGuinness Drathro (uncredited) Drathro (uncredited) See fewer	Wonder Woman (2017)