In the episode, the Simpsons go to a Monster truck rally that features famous daredevil Lance Murdock. Bart immediately becomes enamored and decides that he wants to become a daredevil as well. Bart's first stunt ends in injury, and despite the family and Dr. Hibbert's best efforts, he continues to attempt stunts. Bart decides to jump the Springfield gorge, but Homer learns about Bart's plan and makes him promise not to jump it. However, Bart breaks his promise and goes to jump the gorge. Before the act, though, Homer stops him just in time and gets Bart to swear that he will stop being a daredevil.