Meanwhile, Marge hires a TV show called Sneakers to spy on Homer and see if he is cheating on his diet.
When he arrives home for dinner the next evening, Homer is surprised to see that Marge has hired a formerly obese nutritionist named Betsy Bidwell.
Later, while the kids watch TV, Marge sees an advertisement for a television show named Sneakers, a parody of Cheaters designed for couples who are cheating on each other.
Bart and Lisa, sent out of the house by Marge so she can make an "adult phone call" to Sneakers, tour Springfield National Park.
Lisa takes a long stick and tells him to grab onto it, but inadvertently knocks him off the ledge, and he falls into the trees at the bottom of the cliff.
Bart, feeling guilty, wants to admit his crime to pay the price, but Lisa, frightened of going to jail for being an accomplice, convinces him to keep quiet.
Marge confirms her suspicions of Homer but realizes that the reality show people do not care about their marriage, and if anything, are trying to destroy it.
Nelson appears, playing his lute, catches Lisa's confession on tape and is about to turn them into the police, just as Martin emerges.
Though he punches Martin for prancing around in the skirt, Nelson is glad that he is alive, and tells Bart and Lisa he hopes that they learned their lesson.
Lisa concludes that underneath her innocent appearance is a dark, twisted person, and Bart concurs that killing a nerd is not fun.
The first one is "Gonna Fly Now", the theme from Rocky, played as a funeral march, the second one (during the slideshows with clips of Martin from previous episodes) is "I Will Remember You" by Sarah McLachlan.
When Martin explains how he survived in a flash back it shows him falling through trees in a way similar to the 2005 movie Hoodwinked!.
He felt that the "addition of Nelson as an investigator to the conspiracy was an interesting move on the producers' part", and that the Homer subplot was "entertaining and better than the rental car plot he had [in "The Debarted"]".
He went on to say that "while the diet cheating storyline was great silly fun, it was the turmoil that Bart and Lisa went through that really made this an outstanding episode."