I Dream of Jeannie (1965)

S5E12 My Sister, the Homewrecker

Jeannie's sister makes her last chaotic appearance, creating more trouble. Disguising herself as Jeannie, she leads everyone to believe that she is involved in a romantic affair with fellow astronaut Biff Jellico, portrayed by Michael Ansara, who is Eden's real-life spouse. Meanwhile, Tony and Jeannie remain completely unaware of the deception unfolding around them, adding to the comedic confusion of the situation.