Endora is at it again! This time, she changes Darrin into an old man and tries to hide him. Too late, the Tates spot Sam and old-man Darrin and she introduces him as Darrin's grandfather, Grover Stephens. Larry plays matchmaker when he brings his widowed aunt Millicent to woo Grandpa Stephens. To break up the date, Sam turns herself into an old woman who poses as Grover's wife! Samantha decides to stay an old woman as long as Darrin stays an old man, and Endora has no choice but to turn him back to normal.