Adelaide

Adelaide is one of the Doctor's cleverest and most strong-minded companions. She and the Doctor face terror on the Red Planet in one of the scariest adventures yet in the special, "The Waters of Mars."

Lindsay Duncan is a British stage and screen actress. Her credits include playing Servilia Caepionis in the HBO series Rome, Lady Elizabeth Longford in the TV film Longford, Prime Minister Margaret Thatcher in the film Margaret, and Alice's mother in the upcoming Tim Burton film, Alice in Wonderland.