Doctor Who (1963–1989)
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The Trial of a Time Lord: Part Five 

The court looks into the Doctor's investigation of Thoros Beta, home planet of the Mentors whom the Doctor suspects of selling advanced weaponry to primitive cultures.


Ron Jones


Philip Martin (by)

On Disc

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Episode complete credited cast:
Colin Baker ... The Doctor
Nicola Bryant ... Peri
Michael Jayston ... The Valeyard
Lynda Bellingham ... The Inquisitor
Brian Blessed ... King Yrcanos
Nabil Shaban ... Sil
Christopher Ryan ... Kiv
Patrick Ryecart ... Crozier
Alibe Parsons Alibe Parsons ... Matrona Kani
Trevor Laird Trevor Laird ... Frax
Thomas Branch Thomas Branch ... The Lukoser


The court looks into the Doctor's investigation of Thoros Beta, home planet of the Mentors whom the Doctor suspects of selling advanced weaponry to primitive cultures.

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sixth doctor | See All (1) »


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Release Date:

4 October 1986 (UK) See more »

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Sound Mix:




Aspect Ratio:

1.33 : 1
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Did You Know?


Fans voted this number 129 in a countdown of the 163 Doctor Who (1963) stories in Outpost Gallifrey's 40th anniversary poll in 2003, making it the least popular story of the Trial of a Time Lord season. See more »


Lord Kiv: Take charge, Sil. I will be dead as that roc if I wait for them to find the intruder. At once, before I perish - THEN where will you be, eh? Dead! No, worse than that - poor! Oh! Oh, oh, my head!
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Featured in When Worlds Collide (2012) See more »

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User Reviews

The Trial of a Time Lord: Part Five
12 June 2019 | by Prismark10See all my reviews

The second story on The Trial of a Time Lord saga is popularly known as Mindwarp.

You eyes will certainly warp with the garish neon opening scenes with pink seawater. It is something straight out of a David Bowie video of Ashes to Ashes from 1980.

The Doctor and Peri land in planet Thoros Beta. The Doctor knows that the predatory capitalists the Mentors are here. The story sees the return if the vile Sil who featured in Vengeance on Varos. The leader Mentor Kiv is ill and scientists have been engaged in body experiments to save Kiv.

It is a dark story from writer Philip Martin. In the first episode we encounter a wolf/man hybrid who begs the Doctor and Peri for help. Colin Baker is more restrained in his performance and has a genuine friendship with Peri while also leading her on to danger.

The good bit is Brian Blessed spent most of the episode comatose. You can tell the director is holding his booming voice and fruity performance back for later episodes.

The bad bit in the first episode are the cutaway to the dreary trial scenes. Even the The Inquisitor has had it with the brickyard jokes.

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