4 episodes were broadcast on February 24th
The Doctor acquires a sample of the web, he, Jamie and Victoria return to the HQ to examine it.
The Doctor and Jo land on a spaceship as it is attacked by Ogrons, which the human crew see as Draconians.
The Doctor and the Shadow have their final confrontation to take control of the Key to Time.
On the volcanic planet of Sarn, Turlough finds evidence of an old colony of Trion, his home world.
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