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Fed up with the squabbling between Beaver (Jerry Mathers) and Wally (Tony Dow), mom June (Barbara Billingsley) demands that the boys call a truce. Swept up in the seriousness of the moment, Beav and Wally take a vow never to do anything without each other. Alas, this Damon-and-Pythias pact is tested when both boys receive invitations to two separate social events. Buddy Hart makes the first of several recurring appearances as the Cleaver boys' friend Chester.