The Doctor and Turlough arrive on Lanzarote to investigate a signal. Turlough rescues American Student Peri Brown from nearly drowning and discovers she has in her possession a data core from Turlough's home planet Trion. The Doctor, Turlough and Peri follow the signal to the volcanic planet Sarn, where the natives worship a fire god known as Logar, and where the Doctor learns The Master has accidentally shrunk himself after testing a more lethal version of his tissue compression eliminator and has taken control of Kamelion, using him to find numismaton gas that will restore him to his normal size. Written by
Did You Know?
Peri is dry by the time Turlough brings her into the TARDIS despite having only just been rescued from drowning in the sea moments earlier. See more
The unbelievers are harmless.
Yes, but it's still a wise precaution to send the occasional free-thinker to the flames. Encourages faith in our traditions.