As they try to adjust to life without Tegan, The Doctor and Turlough are forced to come to the aid of their friend Kamelion, who is being attacked by a mysterious external entity. Meanwhile, a distant planet is facing it's final hours due to the wrath of a vengeful god. This week, Paddy and Tricia follow The Doctor and his companions as they brought to a planet in the grip of religious turmoil that has potential ties to Turlough. Can they find out who is behind the attack on Kamelion and survive the Planet of Fire?