Kurt Filpots, AKA Mr. Banjo, is a lesser-known enemy of Captain Marvel (or Shazam). Kurt Filpots was an agent for the Axis powers during World War II. He dressed in a shabby green suit and straw hat who carried around an old banjo with him, in which Filpots delivered secrets to the Japanese in the form of musical notes. Although evil, Mr. Banjo would go up against Captain Marvel with nothing more than a banjo.