The Twin Dilemma is the seventh and final serial of the 21st season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts from 22 March to 30 March 1984. In the serial, the alien Gastropod Mestor (Edwin Richfield) plots to explode the sun of the planet Jaconda to scatter his eggs throughout the universe to conquer it. It was the first to star Colin Baker as the Sixth Doctor uniquely being the final story of the season. Plot After his regeneration, the Sixth Doctor starts behaving erratically. He goes to the wardrobe looking for a new outfit and finds a glaring, mismatched, brightly coloured coat to which he immediately takes a shine. Peri tells him that he could not go outside wearing such an awful garb, to which the Doctor takes offence. Two twins, Romulus and Remus Sylveste, receive a visitation from a mysterious old man called Professor Edgeworth. They question how he managed to get inside their house; he tells them he will return when their father is there, then abducts them. They arrive on a spacecraft in deep space. Edgeworth then communicates with his superior, a slug-like creature called Mestor, who instructs Edgeworth to take the twins to Titan 3. In the console room, the Doctor has a funny turn, quoting a poem about a Peri — a good and beautiful fairy in Persian mythology, but one which used to be evil. The Doctor accuses her of being evil, and of being an alien spy before rushing toward her and throttling her. He catches a sight of his own manic face in a mirror and collapses in a heap, releasing Peri. When she tells him that he tried to kill her, he initially denies he could be capable of such an act, but seeing how terrified of him she is, decides he must become a hermit on the desolate asteroid Titan 3. The twins' father contacts the authorities; he found Zanium in their room — a sure sign of intergalactic kidnap. A Commander Lang begins the pursuit and soon finds a suspicious ship previously reported missing. He tries to contact it, but it enters warp drive — something that class of ship is not designed to do. On Titan 3 the Doctor and Peri hear the crash landing of a craft. Examining its wreckage, they find the concussed body of