Dudley Do-Right was added to Rocky & His Friends beginning with the 3rd season (1961-2). Only 5 shorts were produced that year, but the number would start to increase with each successive year. In 1969, Dudley was spun off into his own Sunday morning series, as the franchise had returned to ABC after finishing its initial run on NBC.
"Trading Places" closed Dudley's 3rd season as part of Rocky & His Friends/The Bullwinkle Show. In it, Dudley (Bill Scott) swaps jobs with Nell Fenwick (June Foray), but Nell's father, Inspector Fenwick (Paul Frees) tries discouraging Nell, even after she's captured Snidely Whiplash (Hans Conreid).
Nell never even bothered getting fitted for a uniform, probably because, as we'd see, her father wouldn't have allowed it. That flaw hurt the humor in this story.