
Ben Cartwright is the patriarch of an all-male Nevada ranching family. Set during and after the Civil War, "Bonanza" is the story of life on the family's thousand-acre spread, known as the Ponderosa, near Virginia City. Ben has his three sons, each with a different (and deceased) mother. Serious eldest son Adam hopes to follow in his father's footsteps; middle son Hoss is a gentle giant -- physically strong, but sometimes naive; and youngest son Little Joe is the most impetuous and romantic of the offspring.
A member of a powerful gang murders a shopkeeper; the deputized Cartwrights sentence a murderer to hang at dawn when the leader of the gang kidnaps Ben and holds him hostage.
As Ben prepares to run for governor, Joe must come to his rescue when a disabled police officer from New Orleans comes to arrest Ben on a 20-year-old murder charge.
A young bank robber gets a job on the Ponderosa to prevent the sheriff from finding the other members of his gang.
A silver baron promotes a feud between the Cartwrights and the Bishops over timber rights on disputed land; guest James Coburn.