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|Place of origin:||Britain|
|Appearance:||The Darkness of Glass|
|Main voice actor:||Mark Lewis Jones|
Oliver Mortlake was a professor. He thought that the Fourth Doctor and Leela were part of the Caversham Society. He invited them into the castle. He was an expert on Mannering Caversham. He and Leela saw a shadow creature. He wanted to release the demon that Caversham had trapped. (AUDIO: The Darkness of Glass)