When the Simpsons get an RV camper, they go on a camping trip. However, they nearly go over the edge of a cliff. The family get out just before is falls off the cliff and blows up.
Homer and Bart set off to find help, while Marge and Lisa stay behind, however, unknown to Homer and Bart, Maggie follows them and is taken in by a family of bears. Homer and Bart accidentally walk over the edge of a waterfall, and lose their clothes. Trying to find food, Homer wanders into a mud pool and is mistaken for Bigfoot by a naturist with a video camera.
The film is broadcast of the TV news and makes the front page headlines. However, Marge identifies "Bigfoot" as her husband. Homer emerges from the woods and is captured by hunters and taken to a science lab for tests, which are to be inconclusive as to whether Homer is man or beast.