Little Joe stays back at the Ponderosa to tend to its operation as Ben, Hoss, Candy and Hop Sing leave for a cattle drive, who leave as a severe thunderstorm approaches. Joe goes to the barn to calm a horse that was spooked by the thunder and lightning. But just when it seems like the horse has settled down, the horse goes wild, knocking down Joe and crushing his left arm and breaking his leg. Joe goes in and out of consciousness and, after struggling against driving rain and winds to get into the house, treats his wounds. However, the arm is infected and Joe, fearing gangrene has set in, debates whether to amputate the wound.