This pilot launches the saga of the Cannon family as they fight to establish a ranch in the Arizona territory of the 1870s. Marauding Apaches led by Cochise are on the warpath. The Army orders the Cannon family to move on, but Big John Cannon won't budge. While his brother Buck rides off to recruit gun-carrying cowhands, Big John learns of another enemy: a Mexican land baron claims the Cannon property, and dispatches his men to seize the cattle.

John Cannon's first wife is killed during an Apache raid. Buck, his brother, can't stop Mexican bandits from rustling cattle. Unable to fight on two fronts -- against Mexican marauders and the Indians -- John arranges a defense agreement with his neighbor in Mexico, Don Sebastian Montoya.

Victoria's efforts to overcome husband John Cannon's memory of his first wife are thwarted when Apaches lay siege to their ranch, and she is kidnapped.

John Cannon must decide whether to send his son to possible death to save their besieged ranch.

Buck, Manolito and Billy Blue are sent to Tucson for food, supplies and boots, but are sidetracked instead by women and song.

The future of the ranch is jeopardized when bandits steal a prize bull and breeding stock which Billy Blue Cannon and Manolito Montoya have bought in Mexico with the last of the Cannon money.

John Cannon needs cattle from Mexican ranchers for his Army beef contract, but finds the frightened men are being forced to sell at cheap prices to a ruthless cattle buyer.

Buck, Victoria and Manolito return to the Montoya Ranch and become prisoners, with Don Sebastian, of a degraded former Civil War friend of Buck.

When Billy Blue Cannon is forced into a showdown with wanted gunfighters, he is saved by a wandering dentist who proves to be fast with a gun. John Cannon returns the favor to Doc Henry by agreeing to send Billy Blue to help the dentist establish a practice in Tucson.

Mistakes of an inexperienced eastern bank clerk who attempts to settle on a ramshackle ranch near the Cannon family threaten to wipe out the cattle industry of the territory.

Billy Blue Cannon faces possible hanging when he is court-martialed on the charge of killing an army general's son.

Buck Cannon goes to work as foreman for a lovely neighboring widow, and clashes with his brother John when the job appears permanent.

Billy Blue Cannon faces possible hanging when he is court-martialed on the charge of killing an army general's son.

John Cannon risks breaking a mutual defense agreement with Victoria's father and dissolution of his marriage when his ranch hands join a posse searching for marauding bandits in Mexico.

Henry Silva guest-stars as a revolutionary who plans to assassinate Benito Juarez, exiled President of Mexico, on the Cannon Ranch.

Fernando Lamas guest-stars as a Mexican bandit turned revolutionary who captures and prepares to execute the Cannon Ranch hands to prove his power.

An Apache renegade and his followers plan to kill Cochise's peace representative in the Cannon ranch house and start a new Indian war.

John Cannon and Billy Blue are captured by Apaches far from home and made to face death from lack of water.

John Cannon drives gold seekers from an abandoned mine on his land and they retaliate by plotting to kill the Cannons.

The Cannons care for a wounded relative who repays them by stealing the ranch payroll.

Billy Blue Cannon plans to earn money for an expensive silver saddle by boxing.

Buck and Manolito invade the Apache stronghold to rescuer a captive white girl.

Buck Cannon jeopardizes his life, when he tries to turn two Apaches into wranglers.

Ricardo Montalban guest-stars as a wounded bandit leader who is captured by the Cannons and tells them his followers will destroy them unless he is released.

Billy Blue Cannon quits the ranch after a quarrel with his father and leads a peace representative of the President to Cochise.

A bounty on Apache scalps disrupts peace between the Cannons and the Indians.

Ramon Novarro, silent film notable is guest star as Padre Guillermo, who flees Mexico to escape the vendetta of a twisted killer.

John Cannon is forced to relive his final days in the Civil War by a man he disfigured in combat.