Doctor Who (old)

Season 1 Episode 21:

The Sea of Death

On the planet Marinus, the Doctor and his companions are enlisted by Arbitan to seek out the keys to an ancient and powerful machine. Their quest takes them across time and space; will they be able to return the keys before Marinus falls under the control of the alien Voord? (Originally broadcast in six parts.)
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About Doctor Who (old):

Time and Space traveling adventures of a Gallifreyan Time Lord only known as the Doctor and his companions, traveling through time and space.