Kylex-12

Kylex-12 or sometimes Kyle was an android created by the Nix. He was a servant of 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. He later dated 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)