Following on from where last season's finale left off, Niles and Daphne drive off in the Winnebago, but decide to go back and face the music. They tell Donny and Mel that they are in love with each other and naturally Donny and Mel are upset. Daphne and Roz are sending back the wedding presents (despite the efforts of Simon to keep them for himself) when there's a knock on the door. It's a deliveryman. On behalf of Donny, he's brought flowers for Daphne - and a lawsuit. Donny is suing Daphne for leaving him at the altar! Frasier goes to see Donny and tells him that he too was left at the altar (by Diane Chambers in Cheers); but when Donny finds out Frasier's involvement in getting Niles and Daphne together, he adds Frasier to the lawsuit. Meanwhile Mel has revenge on her mind as well... (thetvdb.com)