Turlough realises the imminent volcanic bursts will destroy Sarn, so he uses a communication unit to get in touch with Trion and plead for a rescue ship to evacuate the planet. Acting on a message from the Doctor, Turlough programs the TARDIS to rescue the Doctor and Peri from the gas control room, forgoing a chance to stay aboard and escape from the military arriving from his homeworld. He finds out that a general amnesty has been issued and he is free to return home. Only the elders choose to remain on the planet to die, facing the erupting volcanoes, Timanov retaining his faith even in the face of Amyand's revelation that Logar was merely a man in a fireproof suit: "Another deception!" The Doctor succeeds in weakening the Master's hold over Kamelion and interrupts the numismaton experiment. He adds calorific gas to the surge but is unable to prevent the Master from reacquiring his usual size and becoming—he taunts—"a thousand times stronger". As the gas flow alters, the Master is trapped and the Doctor watches as he is seemingly immolated. Implored by the terminally wounded Kamelion, the Doctor has put the automaton out of its misery using the TCE. Escaping the destruction of the gas control room in the TARDIS along with Peri, the Doctor lands to pick up Turlough, only to find that he has elected to return to Trion. Turlough tells Peri to look after the Doctor. He then parts from the Doctor, thanking him for all that he has learned in his travels with him. As the Doctor and Peri return to the TARDIS, she says she has a few months' vacation left and would like to spend it travelling with him. The Doctor accepts and they depart. Production Costumes It was decided that because of the climate of Lanzarote, where the serial was filmed, the cast would have to alter their usual costumes. Although Peter Davison started the story wearing his cricketer outfit, for the rest of the story, he wore a different pair of trousers with question mark braces and a beige floral waistcoat. Strickson shed his usual school uniform in favour of a blue pin-stripe shirt and tan shorts with a pair of swimming briefs underneath. Nicola Bryant also wore a pink bikini beneath her clothes to which she stripped down for a couple of scenes. Cast notes Mark Strickson has also reprised