Gene Autry (Gene Autry) is a singing cowboy who runs Radio Ranch, a dude ranch from which he makes a daily live radio broadcast at 2:00 pm. Gene has two kid sidekicks, Frankie Baxter (Frankie Darro) and Betsy Baxter (Betsy King Ross), who lead a club, the Junior Thunder Riders, in which the kids play at being armored knights of an unknown civilization, the mysterious Thunder Riders who make a sound like thunder when they ride. The kids, dressing up in capes and water-bucket helmets, play at riding "To the rescue!" (their motto).