AllMovie

Singer Robert Goulet had already spent a season (1966-67) as a TV secret agent on Blue Light when he signed for the theatrical espionager Underground. Goulet plays an American spy who is disgraced during World War II for divulging the names of his fellow agents while under torture. To redeem himself, he joins a French resistance group called the Maquis and parachutes behind enemy lines. His mission is to kidnap a Nazi general and spirit him back to France. Arthur H. Nadel, director of Underground, is most-closely associated with the non-human endeavors of the Filmation cartoon studios.