Robert Goulet, Christine Car+ªr+ª, Donald Harron. The Nazis believe David March is an American traitor, but really he is a secret agent dangerously passing their military plans to the Allied forces and whose real mission is to destroy a German weapons factory. Originally airing as a 3-episode TV series called Blue Light , here it"s stitched together as one film. 1966/color/90 min/NR/fullscreen.