A singing cowboy roams the Wild West with his sidekick, dancing horse and fancy wardrobe.

John Wayne portrays Singin' Sandy Saunders and has a reputation as the most notorious gunman since Billy the Kid. That's somewhat ironic though, since it's later revealed that he's a special Secret Service agent sent from Washington to investigate a land swindle scheme under the direction of town boss James Kincaid (Forrest Taylor).

Bad guys plot to trick a newly arrived Eastern girl out of a ranch which belongs to her infant ward. Roy, of course, saves the ranch for the girl. Songs include "I'm Headin's for the Home Corral," "He's a No Good Son of a Gun," "Sandman Lullaby," "Song of the San Joaquin," and "I'm a Cowboy Rockefeller."

After Pat Garrett kills Billy the Kid, Billy's look-alike Roy Rogers arrives and is mistaken for him. Although a murderer, Billy was on the side of the homesteaders against the large ranchers. As Billy's death is unknown, Roy gets Garrett to let him pose as Billy to continue the fight, but without the killing.

In his starring debut, Roy gets elected to Congress in order to bring water to the ranchers in his district. In Washington, he learns he needs the backing of a key congressman and gets that man to go west for an inspection trip. When the congressman is initially unimpressed, Roy gets the inspection party stranded without water to show ...