Doctor Who: Season 9, Episode 12

The Sea Devils: Episode Four (18 Mar. 1972)

TV Episode  |  TV-PG  |   |  Adventure, Drama, Family
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Ratings: 7.7/10 from 145 users  
Reviews: 2 user | 1 critic

The Sea Devils attack the island prison and rescue the Master, prompting the Doctor to venture underwater to try and contact them.


(as Michael Briant)


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Episode complete credited cast:
Roger Delgado ...
Edwin Richfield ...
Clive Morton ...
David Griffin ...
June Murphy ...
Alec Wallis ...
Colin Bell ...
Brian Vaughan ...
Lt. Commander Watts
Stanley McGeagh ...
Pat Gorman ...


The Sea Devils attack the island prison and rescue the Master, prompting the Doctor to venture underwater to try and contact them.

Plot Summary | Add Synopsis

Plot Keywords:

master | third doctor | dandy | See All (3) »


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Release Date:

18 March 1972 (UK)  »

Company Credits

Show detailed on  »

Technical Specs

Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


While filming the scene in the minefield, Jon Pertwee injured his ribs when he dove forward and fell on the sonic screwdriver prop, which was sitting in his breast pocket. See more »


Just after the Doctor and Jo enter the mine field and as the Doctor removes his sonic screwdriver a mic can be seen on bottom left of the screen close to the ground. See more »

Crazy Credits

The BBC wish to acknowledge the help given to them by the Royal Navy in the making of this programme See more »


Featured in Doctor Who Live: The Afterparty (2013) See more »

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User Reviews

Great example of Pertwee era 'monster threatens the Earth' format.
29 September 2014 | by (South Wales, UK) – See all my reviews

Review of all 6 episodes:

The Master teams up with reptilian creatures who have been dormant under the ocean for millions of years to try to conquer humanity (again). These creatures, which are dubbed Sea Devils by terrified humans, are relatives of the 'Silurians' or as The Doctor re-names them Eocenes. They were on Earth before humans and want to claim the planet back after eons of suspended animation in the ocean depths. The Doctor tries to broker peace whilst The Master whips up a war. Human leaders also have the appetite for war so trapping The Doctor in the middle.

This adventure is not flawless but provides superb entertainment and iconic scenes throughout. The first two episodes and last two episodes of this adventure are terrific fun, exciting, interesting, well written and acted with only very minor faults. Whilst the middle two parts are slightly more flawed as the story is marginally stretched over 6 parts, they too are really good. The interest and quality levels never drop below 9/10 and this epitomises Pertwee era Who.

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