The honest John Graham and the crooked Ross Cheswick battle for supremacy. Despite Cheswick's unscrupulous methods, Dan and his handsome bronco Tarzan win the Big Race for Graham. Dan's prize: Graham's lovely daughter Sally.
Steven Bancroft, a young officer in the U. S. Calvary, is given the assignment of ensuring that dirty-work by agents of Spain, Mexico or Russian aren't going to keep statehood-for-California from becoming a reality. Bancroft uses his guns to settle any debates regarding international laws.
Colonel Beldan runs a Wild West show. When Beldan's star attraction switches to his unscrupulous competitor Vicarino, the young Bob Mason takes the opportunity to take over the job with his horse 'Tarzan'.
From Death Valley in the Mojave Desert to Mount Whittier, the outlaw gangs are wreaking havoc on the gold and money shipments from the mines and ranches. Wells Fargo organizes an express service that will insure the shipments and ensure a guaranteed delivery. Granger Hume is hired to help Wells-Fargo deliver on their promise.
Deputy Marshal Jerry Steele (Ken Maynard) heads off to Oklahoma where a gang of nasty cattle rustlers is terrorizing the local ranchers. After a bit of detective work -- greatly aided by a motley group of would-be outlaws deputized for the occasion -- Steele unmasks a supposedly upstanding citizen Bob Crew (Tom Santschi) as the leader of the rustlers.
At a trading post in the Northern Dakotas, Hawk Lespard, an unscrupulous trader, is opposed by Jack Jessup, posing as a gambler but actually a scout for the Overland Stage Co., and Kunga-Sunga, a wizard with the lariat.
Tom Drury, a cowboy whose quick thinking stops a notorious outlaw, "The Hawk," from further misdeeds. The villain, as it turns out, is none other than Henry Suggs (James Mason), heretofore considered a pillar of the community.....
Don Luis O'Flagherty (Ken Maynard), a daredevil comes to the rescue of his long-lost father, "Tiger" O'Flagherty (George Nichols), the supervisor of a supply-wagon train destined for the miners in Sonora. Tiger is being terrorized by Jesse Wilks (J.P. McGowan), who hopes to starve the miners out of their claims. Falling in love with Tiger's ward, Sally (Dorothy Devore), Don Luis manages to turn the tables on Wilks, who is killed attempting to rob the supply train.
Fired from his job for shirking his duties, the 'Knight of the Plains' Bart Miller stumbles across a would-be stagecoach robbery and he rescues damsel in distress Betty Taylor. He takes Betty and her pretty girlfriends to the ranch of her father Bill Taylor. Meanwhile Taylor's foreman Luke Hatton is plotting to rustle his boss' herd with the aid of the corrupt lawyer Harkness.
Gerald, the somewhat frail son of a wealthy New York family, is bested at the beach by Bill, a strapping young cowboy from Arizona. His fiancée Mary, ashamed of Gerald's "yellow streak", leaves him and goes by train to visit some friends in Arizona, with Bill in tow. Gerald follows them, and before long he and Mary winds up captured by Yaqui Indians and Gerald must prove to Mary that he is not the "weakling" she thinks he is by coming up with a plan for them to escape their captors.
Richard Kingsley, son of a financier, trying to aid Marjorie Crenshaw and her sister during a raid on a New York roadhouse, is arrested. His father, enraged by the bad publicity, threatens to disinherit him if he doesn't go to Colorado in search of a mine....
A ranch foreman captures a notorious gang of gold thieves. He ties them up and leaves them for a pursuing posse while he goes out to find the gold they stole. When the posse arrives, the gang's leader convinces them that the foreman is actually the gold thief, and the posse sets out in pursuit of him.
Edith overhears Bart's plan to rob the bank so she informs Ken. But she is also overheard and when Ken goes to investigate, Bart's Henchman Prod frames him for the robbery. Thrown in jail, Ken's pal Pedro arrives with a plan to get him out.
Rex, Slim and the boys are fired by a wealthy rancher but decide to help him out when his daughter intends on marrying a shifty, gold-digging actor. Meanwhile, the rancher's foreman executes plans for a train robbery.
Parker, seeking revenge on Culverson, is bringing in a flood of sheep. Branning signs on at the Culverson ranch to help fight them off. Standing in his way is hired gunman and crooked lawyer Sneed. T
One day, a lone horseman rides into town with a wounded man strapped behind him. Joe, the Ace, had captured one of the bandits who had held up the armored payroll car headed for the dam construction site, takes the wounded man to the police and claims the reward offered. He is told to wait until the driver of the armored car returns to identify the bandit and goes over to the Blue Star where he is introduced to Mishima, the owner of the cabaret, who is highly respected in the town. Joe then meets Saburo, while fishing, and his lovely sister, who seem to sense the real man beneath the rough appearance and take him into their home. Word reaches Joe that the bandit he'd captured had been shot and he hurries over to the hospital.
Hidden Valley has managed to retain its Old Western atmosphere, free of modern-day corruption, until escaped convict Smitty arrives with plans of taking over and opening the town up as a gambling resort. It's up to Rex Allen and his pals to put a stop to it and sing a few songs along the way.