The Woman (A Life in the Day)
From Tardis Wiki, the free Doctor Who reference
The Woman was looking for Liv Chenka. She murdered the receptionist of the Ritz and then tried to kill the Eighth Doctor. She sent androids after the Doctor and Kitty Donaldson. She wanted the Doctor's TARDIS for her controller. She tracked it down by Liv's signature in the Ritz register. Martin Donaldson incapacitated her. She wanted to destroy London with a temporal grenade. (AUDIO: A Life in the Day)