The Big Valley

While preparing for a major cattle drive bunching the Barkley's herd with those of other ranchers, Heath has major difficulties being accepted as a Barkley, especially by the ranch hands. Then when Nick's former commander in the war comes to visit, Heath is suspicious of him, and with good reason. He is there to cause trouble and steal the herd!! Nick ends up getting shot while on the drive and has to be taken to town, leaving Heath in charge of the drive. Heath ends up saving the day, and finally the hands begin to accept him as a true Barkley.

Victoria begins to wonder if Tom ever truly loved her, if he could go off and have an affair which produces a child. So she's off to Heath's hometown Strawberry to find out more about Tom and Leah's (Heath's mother) relationship.

Audra is save by a man who claims to be a mustang hunter, but who's band of mustangers are also extorting protection money from the farmers and ranchers of Stockon. While Audra is smitten with him her brothers are suspicious, and soon find out the truth. Which Audra does as well. . .after she is kidnapped by them.

Victoria sells land to an old friend, while the Barkley boys are part of a plan to flood it!!!

While Heath investigates violence at one of the Barkley mines, he discovers that the miners hate the Barkley's for unkept promises. This discovered they work to set things right before anything else happens.

Heath falls for a beautiful spanish girl, whose father happens to be involved in a land dispute with the Barkleys! Her father disapproves of Heath because of his illegitamate birth, picturing a much finer bred man for his only daughter. He sets about using the land problems to break them apart.

An old childhood friend of Audra's returns whom she'd like to be involved with. She doesn't know however that he is emotionally disturbed, dangerously so.

Victoria is in a mission church with a pregnant indian woman, when an earthquake collapses it into a forgotten mine underneath. As if the situation isn't isn't bad enough. . they are also trapped with a man whom Nick had fired and who now has a serious grudge against the Barkleys.

Jarrod defends a man accused of murder, even though the only witness is his own brother, Heath!!

When one of Nick's old friends, Mariano Montoya, comes through town on his way to sell his cattle, trouble hits in the form of deadly anthrax. The man's cattle begin to die off and it seems as though they will have to shoot them all, killing as well Mariano's dreams for the money. Until Eugene tells them of something called immunization, which he believes will work. Mariano isn't so sure however and tells them that to prove it works, the Barkleys must first try it on their own prize bull!The bull collapses and it looks as though it has been killed but then it moves and gets up, it works!! Mariano's herd is saved!