PETER SAGAL, HOST:
If there was ever an audience to whom I didn't need to explain what "Doctor Who" is, I am looking at it.
SAGAL: Now, one of the actors who played Doctor Who is Matt Smith, who also plays the young Prince Philip on the hit TV show "The Crown."
BILL KURTIS: Peter began our interview earlier this year by asking him which show had the most obsessive fans.
(SOUNDBITE OF ARCHIVED NPR BROADCAST)
MATT SMITH: There's only one winner...
SMITH: ..."Doctor Who..."