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Though she promised Darrin that she'd give up her responsibilities as Queen of the Witches, Samantha is obliged to attend an important witches' convention. To fool Darrin, Sam prevails upon her lookalike cousin, Serena, to take her place in the Stephens household -- just when Darrin is planning a second honeymoon at Moonthatch Inn. This episode not only offers a rare instance in which Darrin teaches Sam a lesson, but also represents one of the final TV appearances of French-accented comedienne Fifi D'Orsay, in the role of concierge Madame Wageir. Originally telecast on October 24, 1968, "It's So Nice to Have a Spouse Around the House" was written by Barbara Avedon.