River Song

Professor River Song is a mysterious archaeologist and convicted murderer who shares a close relationship with the Doctor. Significantly, she was the only companion who knows the Doctor's true name. River and the Doctor have their encounters in reverse chronological order; the Doctor's future is River's past and vice versa. She was an archaeologist already highly familiar with the Doctor when they first meet (from his perspective) in the 51st century, the time of her death. She was, in fact, a future companion of his who traveled with him periodically.According to her, he came to trust her implicitly, though at the start of their relationship (from his perspective) he was generally suspicious of her and almost hostile to her at times. Prior to her encounter with the Weeping Angels, she was imprisoned in the Storm Cage Holding Facility for the murder of someone she described as, A very good man. Best man I've ever known. Background: She is able to fly the TARDIS, which seems to follow her lead far better than The Doctor's. Each time she shows up, she gives a characteristic line that identifies herself to The Doctor: Hello, sweetie. Her lineage is a secret revealed later in the series and it helps explains her connection to the TARDIS and the Doctor. Show less «