The Sea of Death
The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has been forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...
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Airs
Sat, Apr 11, 1964
23 min
Show
Doctor Who
694 episodes
Episode
S1 · E21
in Doctor Who