Frank Sinatra was an American singer and actor in the 20th century. The Brigadier was a self-avowed fan of his. (PHS: Smash Hit) The Doctor was on close personal terms with him, using a cabin owned by Sinatra to hold a party with Albert Einstein and Father Christmas. In 1952, the Eleventh Doctor and Sinatra were both present at a Hollywood party where they performed a duet. (DW: A Christmas Carol)
