Planet of Fire: Part One

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...