The mayor has sent for a gunslinger who, though appearing to clean up the town, is really to be the mayor's means of taking the town over. When Roy and Gabby arrive in Tombstone, Roy is mistaken for the gunslinger. Just as Roy is ready to expose the mayor, the real gunslinger shows up.
While Sam Houston in in the nation's capital trying to get Texas into the Union, his aide is trying to impose a self-serving tax on the use of the Santa Fe trail. The lady owner of a wagon train is using the trail, and a Texas Ranger comes to her assistance.
Hoppy goes undercover as a gambler from the East when Bar 20 cattle are stolen by unknown rustlers. Brennan/Talbot are twin brothers (one a casino owner, the other a rancher) and Hoppy believes they provide alibis for each other while one is out committing crimes. Hoppy gets a job in the casino to learn more but is exposed when a gambling gunslinger notices him.
A crooked real estate manipulator sells worthless land on mortgage to flood refugees, then tries to profit by reselling the land to the state, committing murder in the process, as the Three Mesquiteers work to bring him and his gang to justice.
Mortimer builds a fence for the cattle brought by Ken Morley. To retaliate, Slater who wants access to the land, builds a dam cutting off Mortimer's water supply. When Ken confronts Slater, he is captured. Then lightning destroys the dam and Ken, imprisoned in a shack, is in the path of the oncoming water.
"Red" Davison(Buck Jones), the sheriff of Sun Dog, sacrifices his job and his good name to save his best friend, "Silent" Slade from the hangman's noose, following a framed-up court decision which sentences Slade to hang for the murder of "Scotty McKee (J.P. McGowan). Davidson allows Slade to escape from jail and follows him to aid him in proving his innocence.
The Marshal sends John Weston to a rodeo to see if he can find out who is killing the rodeo riders who are about to win the prize money. Barton has organized the rodeo and plans to leave with all the prize money put up by the townspeople. When it appears that Weston will beat Barton's rider, he has his men prepare the same fate for him that befell the other riders.
Looking for his missing father, Joe Gordon heads into the desert where Elders from a secret village find him unconscious. Attracted to Sheilla O'Neill, the two plan an escape from the village where no one is allowed to leave. But then he learns his father is being held prisoner and finding him, he is also made a prisoner.
Ken Maynard's exceptionally intelligent horse, Tarzan the Wonder Horse, is the star of this western about evil cowboy Steve Frazer (Welch) who gathers horses for slaughter, whose meat is sold to pet food manufacturers. The wild horse Tarzan frees the doomed horses from their corrals, and Frazer convinces the Sheriff that Tarzan is a threat and can be shot on sight. Local cowboy Ken Benson (Maynard) and rancher Pat Riley (Kennedy) work together to clear Tarzan's good name and put Frazier behind bars for his evil deeds.
John Drury saves Duke, a wild horse accused of murder, and trains him. When he discovers that the real murderer, a bad guy known as The Hawk, is the town's leading citizen, Drury arrested on a fraudulent charge.
Billy, after shooting down land baron William Donovan's henchmen for killing Billy's boss, is hunted down and captured by his friend, Sheriff Pat Garrett. He escapes and is on his way to Mexico when Garrett, recapturing him, must decide whether to bring him in or to let him go.
Capt. James Stewart pursues the bandit "The Kinkajou" over the Mexican border and falls in love with Rita, though he suspects that her brother is the bandit.