Lynda Moss was one of the far future Big Brother TV show contestants onboard the Game Station.
When she met the Doctor, he said that she was very sweet and asked her to join him on his travels. Lynda agreed and they set out to save Rose Tyler from her "death" during The Weakest Link. (DW: Bad Wolf)
Soon afterwards, Lynda met Captain Jack Harkness and helped them all battle against the massive Dalek invasion. She lost her life when a Dalek destroyed the observation deck, blowing Lynda into outer space. (DW: The Parting of the Ways)