While the City Administrator's schemes reach their climax, the Doctor and Ian venture into the tunnels under the city to discover the real cause of the Sensorite plague.
Did You Know?
This episode takes place in the 28th century. See more
When Carol writes her letter it reads "John, have gone to space ship. Carol." But when John receives the letter it reads "John, have gone up to space ship. Carol." The location of the ink smudge in the left-hand margin also moves. See more
Grandfather and I don't come from Earth. Oh, it's ages since we've seen our planet. It's quite like Earth, but at night the sky is a burned orange, and the leaves on the trees are bright silver.
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