Nyssa is a fictional character in the long-running British science fiction television series "Doctor Who". She is played by Sarah Sutton. Nyssa came from the planet Traken. Nyssa was created by writer Johnny Byrne for the Fourth Doctor serial "The Keeper of Traken", but the production team later decided that she should join the Doctor on his travels. She returned in the next serial "Logopolis", in which the Fourth Doctor regenerated, and remained as a companion of the Fifth Doctor. She was a regular in the programme from 1981 to 1983. Sutton was the youngest female actor to play a companion in the series.