In this great behind-the-scenes short from the Hobbit, I discovered that Sylvester McCoy is in the film as Radagast, another of the wizards, i.e. a peer of Gandalf.

McCoy is of course already immortal in fandom as the 7th incarnation of the Doctor back in the 80s; his tenure — the 24th, 25th, and 26th seasons — closed out the original TV series, though he went on to do a TV movie in 1996.

(Giant Nerd Alert: Note that, in Tolkein, wizards are not human beings. They’re closer to angels or demigods.)