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Kylex-12 or sometimes Kyle was an android created by Teldek. When her ship crashed, he teleported to Earth, where he helped her establish herself in the civilisation and conceal herself from the Nix. She instructed Kylex-12 to search the Earth for other extra-terrestrial visitors. In 1982, he began dating Tegan Jovanka when he sensed a temporal energy signature, which were harmless exotic particles and a side effect of TARDIS travel, after the Doctor left her at Heathrow Airport. They met again after this with the Fifth Doctor and Nyssa. (AUDIO: The Waters of Amsterdam)