SYNOPSIS: The time is December 1942, the setting is a radio station where "Cowboy Chuck and the Happy Rangers," a children's adventure program featuring hero Cowboy Chuck, his best gal, his sidekick, the villain, and the announcer all wrapping up an episode. When the station manager informs them this locally-produced show is about to make its nationwide debut and Life magazine photographers are coming to do a story on them, they are thrilled, but not about having to wear the outrageous western costumes chosen for them. Behind the scenes, however, trouble is brewing, as the actor playing the show's villain, who is actually an undercover FBI agent, discovers that the station owner is a Nazi sympathizer and the new script they are to perform coast-to-coast contains coded secrets on national security about to be broadcast to the enemy. The confused cast, the bumbling sound effects man, the prim organist, the show's bickering husband-and-wife team of writers all work together in true bumbling, patriotic "Cowboy Chuck and the Happy Rangers" can-do fashion to foil the bad guys.