Throughout this episode, Mickey wears a T-shirt which has a picture of the Nintendo Entertainment System controller over the caption, “Know Your Roots”. “The Girl In The Fireplace” is a fantastic episode of Doctor Who, and it’s a definite contender for the best single-episode standalone of David Tennant’s tenure. Online watchalong events continue to reunite faces from fan favourite episodes of Who This set also features a clockwork droid which hides in Reinette's room.