Hank, Dale, Bill and Boomhauer enter the Durndle County Lawn Mower Races, but Hank is almost sidelined by debilitating back pain that is diagnosed as the result of the genetic condition of not having a rear end.
Buck Strickland and his brother convince Luanne she's got serious talent in the boxing ring, prompting her to pick a fight with George Foreman's daughter, Freeda. But unbeknownst to Luanne, all of her matches were rigged.
After attending couples counseling, Hank and Peggy buy a motorcycle and head for Sturgis, South Dakota to attend a giant biker rally. But trouble erupts when Hank refuses to allow Peggy to do the driving.