 Superintendent Chalmers organizes an exchange of the very worst tenured teachers between the schools in the district, moving several teachers, including Mr. Jack Lassen to Springfield Elementary School where he will teach Bart's class.He bullies Nelson and gives Bart an embarrassing haircut, so Bart schemes to bring him down, with the help of Milhouse.Using a fake social network profile in the name of Miss Hoover, they discover that Lassen is the "Ignis" or "Chosen One" at a desert festival called "Blazing Guy" where he will set fire to an eponymous effigy.