Lucas joins a posse after the Cattleman's Association is robbed of $3,000. Meanwhile Mark goes fishing at a nearby creek. The posse finds the robbers and Lucas wings one of them and his horse bolts. Mark finds the horse and takes him home. When Lucas returns he finds the stolen money and takes it to the sheriff. After he leaves the robbers come by looking for a horse and Mark stalls them until Lucas returns.; Three Reagan brothers come to town to seek revenge on Lucas McCain for a long-ago incident that left their father crippled.; Two men get the drop on Lucas McCain for testifying against their brother and sending him to jail. McCain challenges them to start shooting and the men back down, dropping their guns. McCain's son then comes by, with some cartridges for his empty rifle.; Facts about Winchester rifles and Lucas McCain's specially-made Winchester, the "Flip Special".