Doctor Who (1963–1989)
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Frontier in Space: Episode Three 

The Doctor is sentenced to life imprisonment at a lunar penal colony while Jo encounters an old enemy.


Paul Bernard


Malcolm Hulke




Episode complete credited cast:
Jon Pertwee ... Dr. Who
Katy Manning ... Jo Grant
Roger Delgado ... The Master
Vera Fusek Vera Fusek ... President of Earth
Michael Hawkins Michael Hawkins ... General Williams
Harold Goldblatt Harold Goldblatt ... Professor Dale
Madhav Sharma Madhav Sharma ... Patel
Dennis Bowen Dennis Bowen ... Prison Governor
Richard Shaw Richard Shaw ... Cross
Luan Peters ... Sheila
Caroline Hunt Caroline Hunt ... Technician
Karol Hagar Karol Hagar ... Secretary
Laurence Harrington Laurence Harrington ... Lunar Guard


The Doctor is sentenced to life imprisonment at a lunar penal colony while Jo encounters an old enemy.

Plot Summary | Add Synopsis


Did You Know?


Patel was originally named Doughty. See more »


Prison Governor: I'm releasing you into the custody of this commissioner. He will fly you back to Sirius IV to stand trial.
Dr. Who: And may I ask what I am supposed to have done there?
The Master: Defrauding the Sirius IV Dominion Bank, evasion of planetary income tax, assault and battery committed on the person of a Sirius IV police commissioner, taking a spaceship without authority, and piloting said spaceship without payment of tax and insurance. Landing said spaceship on an unauthorized area on Sirius III, need I go on?
Dr. Who: I seem to...
See more »


Featured in When Worlds Collide (2012) See more »

User Reviews

Very good, but this is one card that's been played too often.
30 January 2019 | by Sleepin_DragonSee all my reviews

The episode itself I really do enjoy. I like the development of the story, I love the scenes of The Doctor on the penal colony, it's a very interesting change, with some lovely, bold characters. It's well paced, with lots going on, some fascinating, layered character play, including the great dynamic between the president and General Williams.

My gripe here though, the use of The Master, you cannot argue with the brilliance of Roger Delgado, he's cool, manipulative, the perfect gentleman, but, they were guilty of using the character too much, there was a sense of mystery early on, wondering who exactly was attempting the ear, it's a little bit of a let down to learn it's him again. Nothing wrong with any of the acting or story, just the laziness of having him behind everything.

Still very good. 7/10

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Release Date:

10 March 1973 (UK) See more »

Company Credits

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Technical Specs

Sound Mix:




Aspect Ratio:

1.33 : 1
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