Lindsay Duncan

Lindsay Duncan (born 7th November 1950) played Adelaide Brooke in DW: The Waters of Mars. She is best known for her portrayal of Katherine in the film Under The Tuscan Sun. She also voiced the protocol droid TC-14 in Star Wars Episode 1: The Phantom Menace. Weeks after her appearance in Doctor Who, she played Alice's mother in the billion-dollar-grossing Alice in Wonderland.

At the time of filming The Waters of Mars, Duncan was 58 years old. As her character was identified by the BBC as the Doctor's companion, this made her the oldest actor to play a companion in the franchise's history. This distinction lasted a little over a month, however, until her record was well-surpassed by 80-year-old Bernard Cribbins in DW: The End of Time.