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The Doctor returns to the city to keep an eye on the Graff, leaving Romana, K9 and Garron to search for Unstoffe and the first segment. However, Garron double crosses them and steals the tracer.
The Graff takes the Doctor, Romana and Garron prisoner and then sets about trying to track down Unstoffe and the jethryk.
In seeking the second segment of the Key to Time, the TARDIS heads for an icy world but lands on a populated planet that shouldn't be there.