Elmer Fudd is a mad scientist who wants to turn Bugs Bunny into a fiend. Bugs tricks this ersatz Dr. Jekyll into drinking his own mixture; later, each thinks the other has changed into a bear.
Elmer Fudd expects to find "west and wewaxation" during his visit to Jellostone National Park, but he sets up camp in Bugs' backyard, and the rabbit (and a neighboring bear) definitely don't have leisure in mind.