Norm continues to have supposed problems with his sister-in-law Donna, which is made worse by Vera's absence. Meanwhile, Diane returns to Cheers, despite her assertion that she would never step foot in there again, if only to apologize to Sam about accidentally eavesdropping on his and Janet's private conversation. Diane doesn't have an opportunity to do what she wants, but gains some intelligence on how best to get the upper hand in her and Sam's relationship, which leads to a public spectacle. The aftermath of that spectacle leads to Sam coming to a conclusion about his marital life. Sam picks up the telephone and tells the person on the other end that he wants to marry her.
—Huggo