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Ida Mortimer was the daughter of George and Helen Mortimer and the sister of Alan Mortimer. They all stumbled into the Doctor's TARDIS when the First Doctor materialised it outside their burning house during the Great Fire of London. They believed he was a warlock and the TARDIS was powered by magic. They travelled with him to the Andromeda Galaxy in the far future. (PROSE: Doctor Who and the Invasion from Space)