SO

Rock band No Vacancy performs at a nightclub three weeks before auditioning for the Battle of the Bands. Guitarist Dewey Finn irritates his bandmates with on-stage antics, culminating in a failed stage dive that abruptly ends the performance. When Dewey arrives for rehearsal the next day, he discovers he has been replaced by another guitarist named Spider. Dewey's roommate and best friend Ned, urged on by his domineering girlfriend Patty, tells Dewey he must pay his share of rent, which is four months overdue. While attempting to sell some of his equipment for the money, Dewey answers a phone call from Rosalie Mullins, the principal of the Horace Green prep school, inquiring for Ned about a short-term position as a substitute teacher. Desperate for money, Dewey impersonates Ned and is hired. On his first day at the school, Dewey adopts the name "Mr. S" (stemming from his inability to spell Schneebly) and behaves erratically, confusing the class.