While digging through Bill's war memorabilia for the upcoming "Normal Ohio Founder's Day Parade," Butch and Pamela find a love letter that was written to Bill by his "Korean plaything" whom he had an affair with during his stay overseas. At the urging of Butch, Bill decides to confide to his wife that he was unfaithful -- but he changes his mind when he learns that Joan had an affair too (and to boot, Pamela unknowingly named her son after the man Joan had an affair with). Meanwhile, Pamela goes to confront Robbie's teacher, Mr. Collins, over Robbie's unsatisfactory homework, but ends up inviting Mr Collins home to tutor Robbie, when she sees how handsome he is. Kimberly has plans of her own when Mr Collins arrives, to confront him with a mistake he made a few years ago when he was her teacher, which he never took the blame for. (thetvdb.com)