Susan Foreman

Susan Foreman was the Doctor's grandchild, and they had settled with her exiled grandfather on twentieth-century Earth. She was a pupil at Coal Hill school when two of her school teachers (Ian Chesterton and Barbara Wright) thought that she was "odd". The two teachers went to the scrap yard where she was meant to live, all they found was a police box. Then after a while, the Doctor came along and they questionned what he was doing about to go into a police box. He opened the door and the teachers heard the music that Susan was listening to in school, and they hear her say "is that you, Grandfather?". They pushed the Doctor out of the way and walked into the Tardis. Susan left her grandfather when they landed on Earth in the middle of the Dalek war. Susan was talking to David Campbell when the Doctor locked the door of the Tardis and took off, leaving Susan on Earth with David. Susan was reunited with her grandfather in the Death Zone on Gallifrey.

Susan was in An Unearthly Child to The Dalek Invasion of Earth, plus The Five Doctors.