Peter Venkman
From Tardis Wiki, the free Doctor Who reference
Peter Venkman was a fictional character.
The Tenth Doctor compared himself to Peter Venkman. (COMIC: Revolutions of Terror)
Behind the scenes
Peter Venkman was a character from the movie Ghostbusters who led the team busting ghosts. He was played by Bill Murray. Having the Ph.D. title, Peter Venkman was, in effect, also a doctor.
