Megan Matthews

 was a student at St Matilda's College. She chastised Lynn Pickering about her superstitions. She told the Fourth Doctor that Lynn had researched the history of the college. Frances Beckett later placed her into the alien spaceship. She showed Leela why the nuns wanted the abducted girls. The Doctor managed to get her out of the machine before it the ship exploded. (AUDIO: The Cloisters of Terror)