"My Sister, the Home Wrecker" marked the ninth and final appearance of Jeannie's brunette sister, furious that the 'naïve simpleton' has claimed for a husband the handsome astronaut she coveted for herself. Her only recourse to break up the marriage, and right after the honeymoon, she proceeds to court air force major and eligible bachelor Biff Jellico (Michael Ansara), making sure that the Bellows catch them in passionate embrace. Neither Tony nor Jeannie have any knowledge of this as they didn't attend Biff's reception, Dr. Bellows hopelessly trying to convince the uncomprehending husband on how a wife needs to be treated (as if Mrs. Bellows were happily married!). With everyone cornering Jeannie in the kitchen for private chats, things get even more interesting when Biff Jellico shows up with a bouquet for Mrs. Nelson. Outside the Nelson residence Jeannie II makes her move on Biff, using her magic to compel him into another amorous encounter. This was the third and final appearance for Ansara, Barbara Eden's then-husband, who would be back for one more episode, directing "One Jeannie Beats Four of a Kind" (his only credit as a director). Farrah Fawcett returns as Roger's girl Tina, from "See You in C-U-B-A," though the credits erroneously show her name to be 'Cindy.'