Classic Doctor Who Season 21 Episode 14 Planet of Fire: Part 2

On Planet Sarn, Turlough finds himself in trouble with both the locals and the android ruler, Timanov, who has declared him a heretic. Meanwhile, the Doctor and Peri explore the ruins of a temple and discover ancient technology that could be the key to stopping the planet from being destroyed by a volcanic eruption. However, the Master has also arrived on Sarn, seeking the same technology for his own nefarious purposes. As the Doctor and the Master face off, Turlough must confront his past and potentially sacrifice his own life to save the planet.