Hermit

For the Time Lord see; the Hermit.

A Hermit was an individual who lived on their own. The Fourth Doctor told Romana that he knew an old hermit who lived in the misty mountains of Southern Gallifrey, who told him of the Record of Rassilon. (DW: State of Decay) The Doctor would play truant so that he could visit him. (EDA: The Eight Doctors)

The Tenth Doctor told Professor Yana that he was a "bit of a hermit." Pointing out Martha and Jack, Yana replied "A hermit... with friends?" to which the Doctor replied that they were "Hermits United" who met up every 10 years to discuss caves. (DW: Utopia)