Bonanza - "The Showdown" (1960)

An outlaw gang robs Virginia City's bank and makes off with almost all of its money. The youngest member of the gang manages to get a job on the Ponderosa as a bronc buster with the intention of informing the bank robbers of any posses that may threaten their hideout. While Ben, Adam and Hoss welcome the newcomer, Little Joe becomes suspicious of his activities.
https://www.imdb.com/title/tt0529652/plotsummary…

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