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.) Written by
Did You Know?
The Voord that falls down the shaft is a cardboard cutout. See more
When the Voord falls through the pyramid revolving wall, a stage hand can be seen briefly on the other side. See more
So the men from the glass submarines are intruders like us?
Yes, but with one difference, which is puzzling but releaving. They died, but we're only prisoners.
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