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Donal Dineen was the father of Aoife Dineen and, along with his daughter, Robert DeValley and Jerome Khan, went to Fleming's Island to search for Imogen Frazer in December 1981. He thought that the Fifth Doctor, Adric, Nyssa and Tegan Jovanka were part of the cult on the Island. He was later killed by the I Predator. (AUDIO: Iterations of I)