"The Husbands of River Song" is an episode of the British science fiction television series Doctor Who. First broadcast on BBC One on 25 December 2015, it is the eleventh Christmas special since the show's revival in 2005. It was written by Steven Moffat and directed by Douglas Mackinnon. The episode marks the return of Alex Kingston as River Song, making her first appearance alongside Peter Capaldi's Twelfth Doctor and her last on-screen appearance to date. This also features the first appearance of Nardole, who would become a companion starting from the next episode.