He is so deeply undercover that except for a few United States Government officials who know that he is a double agent loyal to the United States, the entire world believes him to be a pro-Nazi traitor – so much so that not only does he discover that a woman he loves has committed suicide because of his supposed support for Nazism, but he must also avoid capture or assassination by Allied intelligence agencies unaware that he secretly works for the Allies.

[1][2][3][4] In his adventures, March sees a lot of action and faces many moral dilemmas, such as tough choices between carrying out his orders and protecting innocents.

[3] Episode directors included Grauman, Robert Butler, James Goldstone, Walter Graham, Gerd Oswald, and Leo Penn.

[3] Writers included Cohen, Merwin Bloch, Walter Brough, Dick Carr, Jamie Farr, Harold Livingston, H. Bud Otto, Brad Radnitz, Curtis Sanders, Donald S. Sanford, Roger Swaybill, Jack Turley, and Dan Ullman.

[4] Following the cancellation of Blue Light, its first four episodes, which told a continuous story of David March's efforts targeting a German super-weapon facility at Grossmuchen, Germany, were edited together to create a movie.

The show's 30-minute format also worked against it, forcing episode writers to meet time constraints in part by making David March's opponents shallow as characters and too easy for him to outwit.