Fugitive Doctor

An incarnation of the Doctor, and identified as such by the Thirteenth Doctor's sonic screwdriver, hid out on Earth using a Chameleon Arch, going by the name "Ruth Clayton". This Time Lord had a history working for Gallifrey, in a role "[one did not] apply for", which she sought, though failed, to abandon.

She had her TARDIS buried near the lighthouse where she stored her true identity, and trusted Lee Clayton to protect her, under cover as Ruth's husband. Lee was also tasked with reminding her to "Follow the light and break the glass" when the time was right, as this would lead Ruth to return to the lighthouse, which she was made to recall from childhood, and finally restore her Time Lord memories. (TV: Fugitive of the Judoon)

Working for the Time Lords
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As Ruth Clayton
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Behind the scenes

 * This incarnation is the first televised incarnation of the Doctor to not be caucasian. Previously, the Doctor had briefly taken over the bodies of non-caucasian humans. Daniel Anthony played the Eleventh Doctor in The Sarah Jane Adventures story Death of the Doctor when he occupied the body of Clyde Langer and Damian Lynch played the Third Doctor in the audio story Ghost in the Machine when he was using the body of Benjamin Chikoto to communicate.