Jephson (The Renaissance Man)

Jephson was the curator of the Morovanian Museum on Morovania Minor. He wanted to gather all knowledge, doing so by draining it from the minds of visitors. He allowed everyone to think Reginald Harcourt was the real curator, and he was only Harcourt's butler.

The Fourth Doctor discovered that Harcourt was really another data-storing device for the museum. By feeding Harcourt false data and fictional information, the Doctor made the museum's data system crash, causing all the stolen knowledge to return to the original owners. (AUDIO:  The Renaissance Man)