Hugh "Rocketship X-M" O'Brian is a smarmy 70s secret agent with a bunch of wires jammed into his skull because nobody had invented cellphones in 1972, and he's been told to find a bunch of diamonds rightfully stolen by the Nazis in 1945. Or something.

Meanwhile Burgess Meredith overacts as Hugh's mission control boss and has the wonderful character name of V.C.R. Cameron (hooray for clumsy technology jokes), and Sir John Gielgud(!) plays The World's Most Debonair Nazi. Oh, and there's Elke Sommer as the love interest whose parents couldn't decide whether to name their daughter Madeleine or Heidi so they split the difference.