The mysterious Don Del Oro ("Lord of Gold"), an idol of the Yaqui Indians, plans to take over the gold and become Emperor. Francisco was put in charge of a legion to combat the Yaqui tribe and protect the land, but when attacked Zorro came to his rescue. Francisco's partner recognized Zorro as the hidalgo Don Diego Vega, then ask him to take over the fighting legion as his alter-ego Zorro.

Two young brothers are separated when their wagon train is attacked and their parents killed. One brother Cherokee is raised by Indians and the other, the Kansas Kid, by the outlaw gang leader Buff. Twenty years later they unknowingly meet again when the Kid goes after wagons being guided by Cherokee.

One of the last bills signed by President Lincoln authorizes pushing the Union Pacific Railroad across the wilderness to California. But financial opportunist Asa Barrows hopes to profit from obstructing it. Chief troubleshooter Jeff Butler has his hands full fighting Barrows' agent, gambler Sid Campeau; Campeau's partner Dick Allen is Jeff's war buddy and rival suitor for engineer's daughter Molly Monahan. Who will survive the effort to push the railroad through at any cost?

After railroad agents forcibly evict the James family from their family farm, Jesse and Frank turn to banditry for revenge.

Looking for the killer of his brother, Jack saves the outlaw known as the Mexicali Kid who had collapsed on the desert. Jack joins up with the Kid who leads him to Gorson. Gorson is after a ranch and gets Jack to pose as the heir to the ranch. After the papers are signed he plans to have jack killed. But the Kid recognizes Gorson's henchmen as the men Jack is after and decides to help him.