Harry (Knock Knock)

Harry was a friend of Shireen, and one of the group whom Bill Potts moved in with following the search for decent and affordable student accommodation. He attended the Twelfth Doctor's lectures, and liked him because of them. (TV: Knock Knock)

Behind the scenes

 * An an interview in Doctor Who Magazine #512, writer Mike Bartlett indicated that Harry was intended to be the grandson of Fourth Doctor companion Harry Sullivan, but the reference was cut.