When Reverend Lovejoy reveals that his license to wed couples expired years ago (meaning that Homer's divorce from Marge on "A Milhouse Divided" was legal and Homer ''was'' legally married to Amber from "Viva Ned Flanders"), Homer and Marge set up a third wedding to correct the mistake, but Marge's bridezilla attitude and Homer's disappearance complicate things.

!! Tropes:

* {{Bridezilla}}: '''MARGE'''.
* ComicallyMissingThePoint: Bart believes he won't exist if his parents don't get married.
* ContinuityNod: Howard's Flowers makes its first appearance since "[[Recap/TheSimpsonsS1E13SomeEnchantedEvening Some Enchanted Evening]]", the very first episode produced for the series (and ironically, the finale of the first season due to a TroubledProduction).
** As mentioned above, the whole situation of the episode is a continuity nod to "A Milhouse Divided".
* FromBadToWorse: Homer's situation in a nutshell-starting from the very moment that Lovejoy says that his marriage act was not "legal", Marge goes into a HairTriggerTemper mode that nearly has her walking out on Homer, and then her {{Bridezilla}} act occurs and ''then'' he's kidnapped by Patty and Selma and forced into seclusion until Marge leaves him for good.
* HairTriggerTemper: The very second Marge hears that the second wedding was null, she takes ''everything'' Homer says as some kind of insult and nearly divorces him right then and there--her attitude during the wedding's planning is no better at all.
* ItsAllAboutMe: Marge is at her most selfish in this episode during the wedding planning process. When Homer disappears, she (quite understandably) assumes that he ran away because of her treatment of him.
* {{Jerkass}}: Selma and Patty really cross the line this time by kidnapping Homer just so Marge will think he left her. It's only when Bart and Lisa blackmail them to expose what happened that they do something resembling right.
** Marge goes full Bridezilla and treats Homer worse then she's ever treated him.
* KarmaHoudini: Outside of being blackmailed into paying for the proper wedding, Patty and Selma face no comeuppance for their kidnapping and torturing Homer.
* MyGodWhatHaveIDone: Patty and Selma get a moment of this when they hear Homer's wedding vows, which he kept on his pocket and tearfully reads thinking that he will be locked in the bathroom forever. We don't see what may have resulted of this because immediately afterwards Bart and Lisa arrive and blackmail them. As mentioned above, Marge also gets this reaction when she finds out that Homer disappeared and assumes the wrong reason.
* NotMeThisTime: When a clue with the initials [="SB"=] was found, Bart and Lisa at first assumed Homer was abducted by Sideshow Bob. Homer was actually abducted by [[ObnoxiousInLaws Patty and Selma Bouvier]].
* ObnoxiousInLaws: Patty and Selma are this trope on overdrive. The story never directly tells how long they could have kept Homer locked in the bathroom, but they wanted Marge to go find a better husband, [[FridgeHorror and they had previously shown no lack of desire for him to die... or regard for the trauma that they would create for anybody else finding Homer (they explicitly mention that the bathroom is a rented location)]].
** This can be considered a MoralEventHorizon because neither Patty or Selma were this extreme in the past. They mainly took advantage of a scenario (like Marge getting amnesia) or try to convince Marge to divorce Homer but in this episode they try to kidnap Homer so that Marge would cross the DespairEventHorizon and leave Homer or to have Homer die or force him to leave Springfield out of fear for his own safety or for his family's safety.
* ShoutOut:
** To ''Franchise/{{Saw}}'' when Homer finds himself locked in a dirty bathroom. Thankfully there's no gore involved and the most torture Homer gets is having to lick a lollipop made of hot sauce to get to a key (which wasn't to his lock).
** Bart's assumption under ComicallyMissingThePoint is one to ''Film/BackToTheFuture''.