Wally (Tony Dow) tries to weasel out of attending a cotillion with Mary Ellen Rogers (Pamela Baird) -- not because he doesn't like her, but because he can't dance. Upon learning that Mary Ellen has signed them up for a cha-cha contest, a frantic Wally buys a dance record and spends his after-hours practicing in his bedroom. This, of course, is a source of great amusement for Beaver (Jerry Mathers), who is so merciless in his needling of poor Wally that he precipitates a potential disaster! ~ Hal Erickson, Rovi