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River Song is an archaeologist who claims that she has travelled with the Doctor in his relative future (her relative past). She is referred to in Doctor Who Confidential as a “companion-to-come”,and although the Doctor first meets her on The Library planet in “Silence in the Library“, she states that she has met him on several prior occasions in her relative timeline, but in a time yet to come for the Doctor, referring to specific events and places including the “crash of the Byzantium” “picnic at Asgard” and “the Singing Towers”.River indicates some form of intimate relationship as when she whispers the Doctor’s real name, in his ear in order to gain his trust.In the later episode “The Time of Angels”, companion Amy Pond is convinced that River is indeed the Doctor’s wife but this is neither confirmed nor denied by either River or the Doctor.
When checking where they are in their relative timelines, River mentions “The Bone Meadows” as a previous adventure. River states in her diary that she has pictures of all the Doctor’s faces and that the Doctor still does not know who she is yet. Song had to question the Tenth Doctor on his first and her last meeting, to ascertain where he was on his own timeline. He reveals, inadvertently, to the currently DoctorSong that she will one day be a professor, as in her appearance in “Silence in the Library.”
In “The Time of Angels” River Song tells the Bishop that she will not reveal who she really is to the Doctor because then he will refuse to help her. Before his death in “Flesh and Stone”, the Bishop reveals to the Doctor that River was in the Stormcage Containment Facility for murdering a man who was considered ‘a hero to many’. Later, before being transported to a prison ship, River confirms to the Doctor that she had been imprisoned for killing the best man she had ever known, and that she will see the Doctor again “when the Pandorica opens”.
She returned in Series 6 in the Impossible Astronaut and Day of the Moon. She also appeared in the mid season finale, A Good Man Goes To War. Amy was kidnapped and gave birth to a girl named Melody, and River revealed that she was Amy and Rorys daughter.
River appears again in the fifth episode of the seventh series titled “The Angels Take Manhattan”, where she encounters the Doctor and her parents in 1930s New York City. At this later point in her timeline, she is a professor of archaeology and a free woman, having been released from Stormcage after the Doctor erased all evidence of his having existed from the universe. When her parents are sent permanently back in time by the Weeping Angels, to be forever estranged from the Doctor, she arranges for Amy to leave the Doctor a note in the form of an epilogue to a book. Although she agrees to travel with the Doctor for the time being, she declines his offer of being a full-time companion.
River Song will appear in series of audios called The Diary Of River Song