While participating in a reality TV show, Homer Simpson and Ned Flanders trade places, houses, and just about everything else, and the funny thing is, they kind of like it. Meanwhile, Lisa attends a smart kid summer camp and finds herself caught up in an act of international espionage. Then Bartman's superhero sidekick, Houseboy, takes on superpowers with a push of a button on a cellphone developed by Professor Frink - that is until, he dials a wrong number and becomes a very, bad boy indeed!