New Frontier

When Professor Marsh disappears while searching for the lost city of Lukachukai, his daughter enlists the help of the Three Mesquiteers.

David Ross organizes the ranchers into a vigilante group to rid the town of outlaws. The plan succeeds but the trouble starts when some of the men form a new vigilante group and posing as the original one plunder for loot.

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.

A banker struggles to keep his bank solvent and his town from going bankrupt after the bank is robbed and all its money taken. The Three Mesquiteers ride into town and set out to help.

Three cowboys buy a ranch but have to fight off gunmen to keep it.

The Mesquiteers capture a horse thief who escapes justice through a crooked judge. They gather signatures urging the governor to investigate but a friend with the petition is murdered. Stony is accused.

Unable to legally capture and sell a herd of protected wild horses, corrupt rancher Rance Macgowan uses his trained killer horse, Volcano, to substitute for the real leader of the herd and cause havoc and death among the ranches. With the government about to drop the restrictions on rounding up the herd, the Three Mesquiteers find themselves in the middle of the controversy after their friend, Sheriff Miller is killed by Volcano.

After gold shipments from a mining town have been hijacked, the three Mesquiteers buy a plane to fly the gold out. The owner of the shipping line brings in Eastern gangsters to thwart them.

The Cattlemen's Association has called in the Mesquiteers to find cattle rustlers. They get Tex Riley to pose as Stony so Stony can arrive posing as a wanted outlaw. This gets Stony into the gang of rustlers and he alerts Tucson and Lullaby as to the next raid. But Hartley is on hand and unknown to anyone is the rustler's boss and he joins the posse with a plan that will do away with the Mesquiteers.

Nancy Evans, lovely circus owner, has a ranch that she's never visited, but for sentimental reasons won't sell to Mike Abbott. Her partners, secretly in league with Abbott, sabotage the circus to force Nancy to sell the ranch; instead, she goes there to live. Will her neighbors, the Three Mesquiteers, be a match for the secret swindlers? And what's so valuable about that run-down ranch anyway?

Talbot uses a phony land grant to rule thirteen million acres, taxing everyone heavily and evicting those who won't pay. The Three Mesquiteers becomes mysterious "night riders" to fight this evil.