DOCTOR was an AI created by data generated by an I implant that was placed in the Eighth Doctor's eye whilst he was in prison on Ha'olam. He was intended to be a model of the Doctor's mind and was forced to work out how to operate independently when the Doctor was rescued from Bainbridge. DOCTOR eventually agreed to help Sam Jones and the Doctor defeat the I, after which it chose to explore human dataspace on its own with FLORANCE. (PROSE: Seeing I)

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