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|Place of origin:||England|
|Appearance:||An Eye For Murder|
|Main voice actor:||Janet Henfrey|
Petherbridge was a university researcher. She mistook Peri Brown for Sarah Perry, her favourite writer. She told Peri and the Sixth Doctor about the poison pen letters to Ruth Horwitz. She didn't want the police to look into the matter. She was the principle of the college. (AUDIO: An Eye For Murder)