Clara Oswald
Oswin Oswald is first seen in the first episode of the seventh series, "Asylum of the Daleks". She is the only survivor of the Starship Alaska. The Alaska crashed on the Asylum, a prison planet for insane Daleks. She has lived on the planet for about a year when the Doctor (Matt Smith) and his companions Amy (Karen Gillan) and Rory (Arthur Darvill) go to the Dalek Asylum to turn off the planet's force field. They are trying to do this so that an army of sane Daleks can destroy the asylum. Clara communicates with them and helps them escape from the Daleks. She also removes all of the Daleks' memories of the Doctor. She helps the group escape and the Doctor tries to rescue her. He soon learns that she has already been captured and is now a Dalek cyborg. The Daleks had tried to keep Oswin's intellect.  Because her mind could not deal with being turned into a cyborg, it created a fantasy where she survived as a human. When she learned the truth, Oswin was almost taken over by her Dalek personality, but in the end she still would not kill the Doctor. She deactivated the force field. Clara makes a final request that the Doctor remember her. She then lets the Doctor, Amy, and Rory leave the planet before it is destroyed.