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Jealous Lucy (Lucille Ball) wants to one-up her wealthy former schoolmate Cynthia Harcourt (Mary Jane Croft) by making a large financial pledge to charity. Unfortunately, she doesn't realize how large her pledge really is until the money comes due ("Put me down for five," she said magnanimously -- whereupon she was put down for five hundred!). Desperate to cover the pledge, Lucy and Ethel (Vivian Vance) take jobs promoting the upcoming movie "Women From Mars" -- said promotion requiring the girls to dress as Martians and "invade" the observation deck of the Empire State Building.