Given the fact that my friend asked the owner about Doctor Who, and did his Doctor Who photos in the Diner, I’m sure that he means Doctor Who.
The Doctor’s previous companion, Clara Oswald played by Jenna Coleman, might return for a special appearance in the 2017 Doctor Who Christmas special.
The diner also turned out to be a TARDIS which Clara traveled in with her immortal companion Me, played by Game of Thrones‘ Maisie Williams.
While Capaldi has already filmed the death scene for the twelfth Doctor, his actual departure for the show is still set for the Christmas special, which won’t start filming until July.