"Andrea Yates's universe" is a title based upon conjecture.
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The universe is created by the Trickster and Andrea Yates
Andrea Yates' World was an alternate timeline created by the Trickster when he offered Andrea Yates to live instead of Sarah Jane Smith. The timelines diverged in 13th July 1964, when Sarah (Andrea in the original timeline) fell off a pier and drowned. In the altered timeline, Andrea lived on 13 Bannerman Road, Ealing and had a successful career as a painter. Luke Smith did not exist in this world. Maria Jackson and her father Alan still lived on 36 Bannerman Road. (SJA: Whatever Happened to Sarah Jane?)
