Annie Carpenter

 was a con artist. She thought Orm was made up. She was in a relationship with Michael Pembroke. She was pregnant. She was possessed by the Scourge and converted into the Scourge Bridgehead. Bernice Summerfield managed to use a nerve gas so that Annie's consciousness could reassert itself. She then created a a telepathic conference between Benny and the Seventh Doctor, but the Scourge managed to regain control when the gas ran out. Later she stepped into the Doctor's TARDIS and her consciousness was permanently realigned; Benny used this to help the Doctor escape. (AUDIO: The Shadow of the Scourge)