How to Marry an Astronaut

S4, E10: Jeannie's sister, married 47 times, tells her she's using the wrong methods to get Tony to propose. Wanting Tony for herself, Jeannie II pretends she is after Roger and instructs Jeannie to copy her moves to hook him. Wary of Jeannie II at first, Roger succumbs when she grants his every wish. Although Jeannie tries the same with Tony, everything goes wrong. Tony recounts the unpleasant experiences Roger had with Jeannie II in the past, but he proposes to her anyway. Tony agrees to be best man and the ceremony is planned for Dr. Bellows' garden. Tony confides his misgivings to Dr. Bellows. Feeling that his best friend's impending marriage has unhinged Tony, Bellows order's him to behave as a best man should. With the minister about to pronounce the final words, Jeannie II blinks and the best man and the groom exchange places. Horrified, Jeannie blinks and Tony and Roger switch again. In a duel between the sisters, everyone is enveloped in a dense fog and Jeannie manages to trap her sister in a bottle. Dressed as she is for a wedding, Jeannie makes a last futile attempt to lead Tony to the altar.