The Roy Rogers Show S01E15 - Peril from the Past

A pair of bank robbers arrive in Mineral City and discover that they have an easy target in the bank when they discover the new teller once served time in prison for murder. They then tell the man to help them out, and if he doesn't they'll reveal his past life of crime to the banker. As a result, the banker ultimately fires the teller when it appears he was working with the robbers, and Roy and Dale take it upon themselves to help the man prove his innocence.