Roy and Gabby fight bad guys to save the town of Deadwood.

Doc Lockwood and his gang are trying to take away Autry's contract for supplying horses to the stagecoach line. Parson Brooks joins Autry in an effort to clean up the town of Sadderlock.

Jimmy's father, a rancher, died in suspicious circumstances. To make things worse, Jimmy's disreputable uncle has a plot to take over the ranch. Jimmy turns to his friend Brad, the Marshal, for help.

Gen. Ulysses S. Grant has a job for Wild Bill Hickok (George Houston) and his sidekick (Al St. John).

Kate Diamond owns the Roaring Falls Trading Post from where she directs her gang's gun-smuggling to the Indians. After she short-changes smuggler Stacey, his men attempt to steal the hidden guns, and attack her foreman Nebraska, but he is saved by Jimmy and "Cannonball" on their way to file a homestead claim at Canyon City. Jimmy renews a long acquaintance with Sheriff Harris and his daughter Jessica. The sheriff is wounded by half-breed Danny when he finds a rifle hidden in the latter's wagon, but Jimmy captures the outlaw, a go-between for Kate and the Indians.Wounded and in bed, Sheriff Harris ask Jimmy not to tell Jessica that she is only adopted and that Nebraska is really her father, although he believes her to be dead.

After the Texas Rangers are disbanded, the the reconstruction years following the Civil War, a private state-police force extorts money from the citizens in a "protection" scheme. Ex-Rangers Jimmy Wakely and "Cannonball" Taylor foil an arrest by state-police officers Hamon and Kelly. Commissioner Jed Brant tells his nephew that his old friend Jimmy is plotting against the law-and-order forces. Vic's fiancée and ranch-owner, Sheila Carol, refuses to sign up with the crooked police outfit, and believes Jimmy is an outlaw. On Chief Barton's order, Hamon shoots ex-Rangers Murphy and Payson, so they can be blamed for a raid on Sheila's ranch.

Jimmy joins Cannonball on a visit to the widow Fennamore, Cannonball's old girlfriend, at Firehole. Engineer Colton is killed by henchman Smoky Morgan and Philip Judson hides the body. The engineer, at the request of the widow's niece, Martha, had come to inspect a polluted reservoir. Land Company head Turner and Judson contaminated the water to get the ranchers to vacate so they can grab the land. Judson hires Easy to pose as the engineer, and he reports the reservoir useless but Jimmy's test proves the waters are not deeply polluted. Judson kills Easy to keep him from talking, and casts the blame on Cannonball. But Jimmy has a trick up his sleeve, right after the next song.

A singing cowboy named Jimmy ends up posing as an outlaw called "the Melody Kid" after his big-mouthed friend Cannonball spreads tall tales.

After Marshal Jordan is honored by Jimmy, Cannonball and others for his forty years as a law officer, the Sawyer mine is blown up by Belle's foreman, Kern, following Sawyer's refusal to sell out. Dan Jordan, the Marshal's son, interested in Belle, secretly the head of the outlaws, is lured by her from scouting the road on which his father guards a ore shipment. Jimmy and Cannonball drive off the outlaws, headed by Kern and Burton, but the Marshal is fatally wounded. The town council appoints Jimmy the new Marshal, which disappoints Dan, but Belle persuades him to become Jimmy's deputy, in order to get information from him about ore and payroll shipments. Dan quits as deputy and fights Jimmy when the latter suspects Belle of involvement in the robberies.

A cowboy is arrested for rustling cattle. A lynch mob is formed by his buddy to try and arrange an escape in the confusion. Things go wrong.