During an attack on the stagecoach bound for Cow Town, Puma sees that The Masked Bull is actually Sheriff Terrorbull after Boothill Buzzard accidentally unmasks him. In order to save his identity after his attempt on Puma's life is thwarted by J.R., Sheriff Terrorbull must break his younger brother Horribull out of Sinquitten Federal Prison to pose as The Masked Bull and fool everyone.