Doctor Who Guide: The Trial of a Time Lord (The Mysterious Planet)

Last updated 24 March 2024

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Part Three

Series Episode Number: 642

World Premiere: Sat 20 Sep 1986 - 5:47pm BST [BBC One] (United Kingdom)
First Broadcast: Wed 10 Jun 2015 - 8:00pm EDT [Retro TV]
Running Time: 24 minutes 18 seconds

3.90 Million (UK)

Appreciation Index: 70 (UK)

Chart Position: 98 () (UK)

Recorded on Sat 10 May 1986 in Television Centre 3

With the black light converter destroyed, the Doctor fears for the planet's safety and needs to find the Secrets of the Sleepers and discover why they are there.

Characters hide uncredited
The Doctor		Colin Baker
Peri		Nicola Bryant
The Valeyard		Michael Jayston
The Inquisitor		Lynda Bellingham
Katryca		Joan Sims
Glitz		Tony Selby
Drathro		Roger Brierley
Merdeen		Tom Chadbon
Broken Tooth		David Rodigan
Dibber		Glen Murphy
Balazar		Adam Blackwood
Humker		Billy McColl
Tandrell		Siôn Tudor Owen
Grell		Timothy Walker
Native Guard		Lance Walton (uncredited)
Native Guard		Nigel Davies (uncredited)
Native Guard		Andy Knight (uncredited)
Native Guard		David Foster (uncredited)
Native Guard		Perry Evans (uncredited)
Native Guard		Glen Ford (uncredited)
Native Guard		Dean Lindsay (uncredited)
Native Guard		Brian Cornish (uncredited)
Native Guard		Gary Clasby (uncredited)
Native Guard		Robert Bicknell (uncredited)
Tribesman		Dave Carson (uncredited)
Tribesman		Gordon Williams (uncredited)
Tribesman		Richard Olley (uncredited)
Tribesman		Alex Reid (uncredited)
Tribesman		Stephen Butler (uncredited)
Tribesman		Blue Brattle (uncredited)
Tribesman		Ray Bennett (uncredited)
Tribesman		Neville Denton (uncredited)
Tribesman		Ralph Harvey (uncredited)
Tribesman		John Jones (uncredited)
Tribeswoman (Tribe of the Free)		Jane Thorne (uncredited)
Tribeswoman (Tribe of the Free)		Beryl Lindsay (uncredited)
Child (Tribe of the Free)		Ray Cresswell (uncredited)
Child (Tribe of the Free)		Cindy Locke (uncredited)
Elder (Tribe of the Free)		Barry Lindsay (uncredited)
Elder (Tribe of the Free)		John Lewery (uncredited)
Tribesman		Andrew Bolpitt (uncredited)
Tribesman		Derek Tomson (uncredited)
Child (Tribe of the Free)		Alys Dyer (uncredited)
Child (Tribe of the Free)		Lucy Dyer (uncredited)
Elder (Tribe of the Free)		Kathleen Bidmead (uncredited)
Elder (Tribe of the Free)		Muriel Wellesley (uncredited)
Native (Mysterious Planet)		Malcolm Ross (uncredited)
Native (Mysterious Planet)		Verdi Stewart (uncredited)
Time Lord		Alan Butler (uncredited)
Worker (Mysterious PLanet)		Barry Jacobs (uncredited)
Worker (Mysterious PLanet)		Oscar Peck (uncredited)
Worker (Mysterious PLanet)		Paul Ellison (uncredited)
Worker (Mysterious PLanet)		Rhett Stevens (uncredited)
Worker (Mysterious PLanet)		Eric Corlett (uncredited)
Worker (Mysterious PLanet)		Derek Holt (uncredited)
Worker (Mysterious PLanet)		Ian Johns (uncredited)
Worker (Mysterious PLanet)		Tony McEvoy (uncredited)
Worker (Mysterious PLanet)		David Wild (uncredited)
Worker (Mysterious PLanet)		Laurie Goode (uncredited)
Worker (Mysterious PLanet)		Dave Hanson (uncredited)
Train Guard		John Emms (uncredited)
Train Guard		Mark Kirby (uncredited)
Court Clerk		Geoff Whitestone (uncredited)
Time Lord		Guy Matthews (uncredited)
Time Lord		Ken Pritchard (uncredited)
Time Lord		Kenneth Thomas (uncredited)
Time Lord		Lew Hooper (uncredited)
Time Lord		Derek Hunt (uncredited)
Time Lord		David Eynon (uncredited)
Time Lord		David Bache (uncredited)
Time Lord		Bob Hargreaves (uncredited)
Time Lord		Jack Horton (uncredited)
Time Lord		Leslie Weekes (uncredited)
Time Lord		John Buckmaster (uncredited)
Time Lord		Leslie Fry (uncredited)
Time Lord		Jim Delaney (uncredited)
Time Lord		Llewellyn Williams (uncredited)
Time Lord		Roy Seeley (uncredited)
Time Lord Guard		Jonny Lee-Harris (uncredited)
Time Lord Guard		Rodney Cardiff (uncredited)
Time Lord Guard		Peter Gates Fleming (uncredited)
Time Lord Guard		John Capper (uncredited)
Time Lord Guard		Gary Forecast (uncredited)
Native (Mysterious Planet)		Peter Dukes (uncredited)
Native (Mysterious Planet)		Christopher Holmes (uncredited)
Native (Mysterious Planet)		Paul Le Comber (uncredited)
Native (Mysterious Planet)		David Hampson (uncredited)
Native (Mysterious Planet)		Richard Aldridge (uncredited)
Train Driver		Stewart Newton (uncredited)
Drathro		Paul McGuiness (uncredited)
Tribesman		Derek Tomson (uncredited)
Native (Mysterious Planet)		Alan Richards (uncredited)
Tribesman		T Melbourne (uncredited)
Worker (Mysterious PLanet)		Darren Mango (uncredited)
Worker (Mysterious PLanet)		Steve Ritchie (uncredited)
Worker (Mysterious PLanet)		Wilbert Johnson (uncredited)
Train Guard		Glen McLaughlan (uncredited)
L1 Robot (operator)		Mike Ellis (uncredited)
Crewman		Robert Goodman (uncredited)
Drathro		Paul McGuiness (uncredited)

Production Team include uncredited
Writer		Robert Holmes
Director		Nicholas Mallett
Producer		John Nathan-Turner
Designer		John Anderson
Script Editor		Eric Saward
Title Sequence		Sid Sutton
Costume Designer		Ken Trew
Make-up Designer		Denise Baron
Studio Lighting		Mike Jefferies
Studio Sound		Brian Clark
Technical Coordinator		Alan Arbuthnott
Studio Camera Supervisor		Alec Wheal
Videotape Editor		Stephen Newnham
Visual Effects Designer		Mike Kelt
Video Effects		Danny Popkin
Vision Mixer		Jim Stephens
OB Lighting		John Wiggins
OB Sound		Bill Whiston
Production Manager		Clare Graham
Production Associate		Angela Smith
Production Assistant		Joy Sinclair
Assistant Floor Manager		Stephen Jeffery-Poulter
Title Music		Ron Grainer
Incidental Music		Dominic Glynn
Special Sound		Dick Mills

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Revelation of the Daleks

The Trial of a Time Lord (Mindwarp)