The C.O.W.-Boys get word from Warden Gordon Bordon that Billy the Kidder and his lizard henchmen Lester and Kisser have escaped from prison. When Lily's uncle Rocky gets caught in a cave-in upon finding the lost treasure of the Concudsadors, she plans to enlist Cowlamity Kate to help rescue him only to end up captured by Lester and Kisser so that Billy the Kidder can steal the lost treasure of the Concudsadors. Now the C.O.W.-Boys and Calamity Kate must rescue Lily and Rocky, apprehend Billy the Kidder's group, and recover the lost treasure of the Concudsadors.