Who is River Song and what is her connection to the Doctor?

River Song is a character from the long-running British science fiction TV series Doctor Who. She is played by actress Alex Kingston and was first introduced in the fourth series episode 'Silence in the Library'.

Her connection to the Doctor is a complicated one due to the show's timey-wimey nature. When they first meet, River Song knows the Doctor's name, but he does not yet know hers. This is because their timelines are running in opposite directions, with River having met later versions of the Doctor in her past while the Doctor has only just met her for the first time.

Throughout the series, it is revealed that River Song is the daughter of Amy Pond and Rory Williams, two of the Doctor's companions. She was conceived on the TARDIS and was raised to be a weapon to kill the Doctor, but she eventually rebels against her programming and becomes an ally to the Doctor.

River Song is a fictional character created by Steven Moffat and played by Alex Kingston in the British science-fiction series Doctor Who. River Song was introduced to the series as an experienced future companion of series protagonist the Doctor, an alien Time Lord who travels through time in his TARDIS. Because River Song is a time traveller herself, her adventures with the Doctor occur out of synchronisation; their first meeting (from the audience's perspective) is with the Tenth Doctor (played by David Tennant), the Doctor's first and apparently her last.

River Song first appears in the Doctor Who 2008 series two-parter "Silence in the Library"/"Forest of the Dead" (written by Steven Moffat) during the Russell T Davies era of Doctor Who. Here, she encounters the Tenth Doctor (David Tennant) in the 51st century and, though he has never met her, claims to be someone he will come to trust completely. River, who is a professor of archaeology and carries a TARDIS-colour/pattern diary of her adventures, is able to convince the Doctor of his future trust in her by whispering his real name into his ear, which he explains he would only divulge under rare circumstances.

River Song is the daughter of Amy Pond and Rory Williams, and was conceived in the TARDIS while it was travelling through the Time Vortex. She was stolen away from her parents by the Silence, a religious order who believed that she was the only person who could kill the Doctor. River was raised by the Silence and trained to be an assassin. However, she eventually escaped from them and began travelling through time on her own.

River Song first meets the Doctor in the 51st century, when she is a professor of archaeology. She claims to be someone that the Doctor will come to trust completely, and she whispers his real name into his ear. The Doctor is initially suspicious of her, but he eventually comes to trust her. River and the Doctor have many adventures together, and they fall in love. However, their relationship is complicated by the fact that they are from different time periods.

River Song is a complex and fascinating character. She is intelligent, resourceful, and brave. She is also a skilled fighter and an expert in archaeology. River Song is a loyal friend and a fierce protector of those she loves. She is also a passionate lover, and she is deeply in love with the Doctor.

River Song is a controversial character. Some fans love her, while others find her annoying. However, there is no doubt that she is a popular character, and she has become one of the most iconic companions in Doctor Who history.