The Tenth Doctor refered to the pairing of himself and Rose Tyler as Mutt and Jeff. (TV: Doomsday [+]Russell T Davies, Doctor Who series 2 (BBC One, 2006).) The Ninth Doctor previously refered to Rose and Adam Mitchell as Mutt and Jeff. (TV: The Long Game [+]Russell T Davies, Doctor Who series 1 (BBC One, 2005).)