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Ricky (Desi Arnaz) is anxiously preparing for the screen test that may land him the starring role in MGM's lavish musical version of "Don Juan." Likewise anxious is Lucy (Lucille Ball), who has arranged to feed Ricky his lines while the camera is rolling. Although she herself is not supposed to appear in the text (except for the back of her head), Lucy is determined to prove her star quality by maneuvering herself into close-up range -- and not even being tied to a chair will stop her.