Thanks to a considerable amount of prodding and meddling from Barney, Aunt Bee and Opie, Andy's jealous nature is aroused when Ellie seems to be spending a lot of time with Mayberry's handsome new doctor - a bachelor. The inevitably, and necessarily, close relationship between the town doctor and the town druggist doesn't sit all that well with Andy either.
After Dr. Benson joins Andy and Ellie on their date night (a date Andy practically ordered Ellie to go on), Barney decides to get to the bottom of the situation. However, his attention is quickly turned aside when the new doctor diagnoses him with a vitamin deficiency - producing the usual panic.
Determined to make a stand for his girl and "fight for what's mine", Andy sends Barney in to spy. When Barney mistakenly concludes that Bob and Ellie are planning to get married, Andy rushes over and inadvertently proposes to Ellie - only to discover that the new doctor is engaged and will soon be bringing his fiancé to Mayberry. Although she enjoys watching him squirm, Ellie lets Andy off the hook and they both agree to take things slow for the time being.