Doc

Doc is a fictional character in the cult television series Buffy: the Vampire Slayer. He is played by veteran actor Joel Grey. Doc, while appearing at first glance to be an eccentric old man, is actually a demon with vast knowledge of the dark arts.

When Dawn was looking for a way to bring her mother back to life, Spike takes her to Doc, who has a reputation of knowing about dark magic. While disturbed by Doc's demeanor, and the fact that she manages to get a glimpse of his short tail, she follows his advice. Later Spike brings Xander to Doc for more information, this time about Glory. Doc changes his demeanor and reveals he's a devil worshiper ritual is already underway.

Notes and trivia

 * The common claim is that Doc died when Buffy threw him from the tower. His body, however, should lie about twenty feet from Buffy's, given the staging.  It is nowhere to be seen, leading some to speculate that he recovered from the fall as easily as he recovered from the stab wound.  Later in the series Spike is found to be in possession of some demon eggs he claims he was holding for a friend.  The name of the eggs' seller was "The Doctor." However, considering how strained their relationship was (Doc pushing Spike off the tower and all), it seems unlikely that Doc was behind the egg operation, and more likely that Spike was "The Doctor."