The dastardly Diamond Jack Butler is just a step away from taking control of the entire town of Deadwood. The only thing standing in his way is the fearless Pony Express rider, Calamity Jane. She's determined to save the town and Paddy O'Leary's gold mine, but insists on doing it herself. Calamity also renews her stormy relationship with handsome gambler Wild Bill Hickok. When Butler captures Calamity, it's up to Wild Bill and his friends to rescue her and save the town.