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While coaching Beaver's football team, Wally (Tony Dow) dreams up a secret play which he calls "Old 98." Evidently Beaver (Jerry Mathers) didn't hear the "secret" part, for soon he is telling his friend Penny (Karen Sue Trent) all about this mysterious gridiron strategy. In all innocence, Penny passes along the information concerning "Old 98" to her brother -- who happens to be on the opposing team. This was the final episode of Leave It to Beaver's third season.