The Fugitive Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. She is portrayed by Jo Martin, the first black actor to play the Doctor. The character first appeared in the twelfth series of the programme's revival in "Fugitive of the Judoon", where she was disguised as a woman named Ruth Clayton in 21st century Gloucester. Eventually, she restores her memories, and it is revealed that Ruth is an incarnation of the Doctor.