Three gunfighters (John Anderson, Steven Marlo, Dennis Cross) use a cowardly barber (Whit Bissell) and his son to talk Lucas into a gunfight so they can kill Lucas and take over the town. Guest stars: John Anderson, Don Grady, Dennis Cross
After Lucas is blamed for killing a young man, an outlaw father and his two sons attempt to kill Lucas. Guest stars: Denver Pyle, Warren Oates, Christopher Dark, Buddy Hackett, Rhys Williams, Bill Quinn, Archie Butler
An ailing gunfighter (John Dehner) comes to North Fork to die under a doctor's care in order to spare his family. But the gunfighter is being pursued by bank robbers (John Milford, Howard Ledig) from whom he stole robbery money. Guest stars: Hugh Sanders, Bill Quinn, Glenn Strange, George Brenlin, James Parnell
After Lucas accuses a newspaper writer's (Alexander Scourby) misleading articles of causing an innocent man's death, the writer begins writing articles about Lucas. Guest stars: Joanna Moore, Chris Alcaide
After a wanna-be bounty hunter (Harry Dean Stanton) kills a man (Gregory Walcott) wanted for a crime committed long ago, Lucas and Mark try to protect the widow (Sydna Scott) from learning about her husband's criminal past. Guest stars: Robert H. Harris, Jack Elam
Eddie's daughter (Gloria DeHaven), who is withholding criminal information and stolen money, comes to meet her father (John Harmon) and causes trouble for Lucas. Guest stars: Bill Quinn, Peter Whitney, Ray Teal
Lucas discovers a young married couple (William Joyce and Enid Janes) with yellow fever and cares for them at his house, but Mark lets out the secret which causes panic in town. Guest stars: Dabbs Greer, Fay Roope, Bill Quinn, Hope Summers
A series of events leads to Lucas and Mark being stranded in the middle of a desert with very little food or water, and after Lucas is injured, Mark becomes the only hope for their survival.
An unarmed outlaw (Richard Devon) robs the stage of a lot of money after the outlaw informs Lucas that his son, Mark, is being held hostage at the McCain ranch and will be killed within the hour unless Lucas cooperates. Guest stars: Harlan Warde, Jack Lambert, Baynes Barron, Virginia Christine, Glenn Strange, Charles E. Conrad, Fay Roope, John Harmon
Lucas makes a life-and-death decision when Micah is held hostage and the kidnappers demand the release of a notorious outlaw (Vic Morrow). Guest stars: Rhys Williams, Ken Lynch, Michael Fox, Paul Carr
Lucas respects a dying man's (James Barton) wishes by telling the son (James Franciscus) that his father is a partner in the McCain ranch in order to get him to North Fork, but Lucas finds trouble when the man dies before telling his son the truth. Guest stars: Jack Grinnage, Denver Pyle, Fay Roope, Bill Quinn, Robert Bice, Donald Elson, Lillian Bronson, Harry Harvey, Don Kennedy
A singer (Phyllis Avery) asks Lucas to care for her daughter in an effort to hide the child from its bigoted father (John Dehner). Guest stars: Lillian Bronson, Henry Rowland, Bill Quinn
Lucas becomes involved in a battle between a recently fired cook (Carleton Carpenter) and a cocky trail hand (Steve Rowland) who finds it fun to attack those weaker than himself. Guest stars: John Milford, Robert Bice, Bill Quinn
A surveying party camps near North Fork. Mark carries a milk supply to their campsite. No one is there, and Mark falls asleep in a tent while reading a surveying book. Meanwhile, two of the surveyors (Mike Kellin, Lin McCarthy) have murdered a third (Ted Otis), and are planning a crime in North Fork. Mark awakens when they return. He hears just a little of their talk; just enough for him to think that something bad is going to happen. He tells Lucas, but Lucas is not convinced. Mark must persist
Lucas refuses a shooting competition with wandering buffalo hunter Cass Callicott (John Anderson) and then becomes his new target. Guest star: Dick Elliott
Shortly after his arrival to marry Isabelle (Alice Backes), John Jupiter (Peter Whitney) is taunted and beaten. Guest stars: Sandy Kenyon, Montie Montana
A man (Royal Dano) hires two private detectives to find his long-lost son. They presume him to be dead and try to take Mark to pass him off as the son in order to collect the money. Guest stars: Herbert Rudley, Chris Alcaide, Rhys Williams
Anne Dodd (Christine White), a pretty young widow of a man who was once Lucas' good friend, visits. Guest stars: Michael Pate, June Vincent, John Harmon
The body of a notorious outlaw, the Domino Kid, is brought in by Colly Vane (Robert Culp), who doesn't get the reward for he shot the man in the back. Guest stars: Frank Ferguson, Lynn Cartier, Dennis Cross
Lucas and Mark try to help out a friend (Chubby Johnson) who has been cheated in a horse trading deal. Guest stars: Jack Kirkwood, John Milford, Clegg Hoyt
The Averys (Chubby Johnson, Ellen Corby), Lucas' new elderly neighbors, live under an assumed name to keep the town from knowing they are the parents of a vicious wanted killer (Skip Homeier). Guest stars: Malcolm Cassell, Ralph Moody, and Max Wagner
Teenaged Heller (Gigi Perreau) and her brother (Don Grady) are badly mistreated by their drunken stepfather (Peter Whitney). Guest stars: K.T. Stevens, Hope Summers
Lucas and Mark find themselves held at gunpoint by a prisoner (Richard Devon) being transported on a train, which becomes stranded from a plague of grasshoppers. Guest stars: Arthur Hunnicutt, Arthur Space, Ethan Laidlaw, Hope Summers
Mark learns a new preacher (Robert Knapp) is an impostor. Guest stars: Chris Alcaide, Patricia Barry, John Milford, Hope Summers
Lucas learns why a young soldier (Ron Hagerthy) deserted. Guest stars: Robert O. Cornthwaite, Harry Carey, Jr., Bill Quinn, Richard Alexander
While ill with typhoid fever, Mark has a vision of his mother (Marian Seldes). Guest stars: Karl Swenson, Hope Summers, Natividad Vacío, Dennis Cross, John Abbott, Chuck Hicks
An old friend (Richard Anderson) of Lucas' arrives in North Fork to open a gambling casino. Guest stars: Steve Conte, Dayton Lummis, George Macready, James Flavin, Bill Quinn, Snub Pollard
The daughter (Jennifer Lea) of a prosperous rancher (Douglas Kennedy) is found murdered. Guest stars: Paul Carr, George N. Neise, William Benedict
Lucas receives a series of mysterious threatening notes from an ex-convict (John Anderson) with a grudge. Guest stars: John Harmon, Bill Quinn, Jack Elam
Andy Moon (George D. Wallace) and his young son (Eugene Mazzola) take shelter at the McCain ranch. Guest stars: Richard Evans, Kay E. Kuter, Kelton Garwood, Dick Wilson, Rhys Williams, Charles Tannen