S15E17 My Big Fat Geek Wedding
Principal Skinner and Mrs. Krabapple are going to marry. At his bachelor party Skinner admits having cold feet about the wedding. Mrs. Krabapple notices this at the wedding and she runs away. She finds new love in Comic Book Guy while Skinner, helped by Homer, does his best to win her back. Things all climax at a sci-fi convention where Comic Book Guy plans to marry Mrs. Krabapple and Skinner - disguised as Catwoman - tries to prevent this.