It is parents night and Dewey was asked to go in. He struggles to talk to the parents about what they have done. The police arrive because Ned told his girlfriend and she told the police and now Dewey is in big trouble. He runs away and goes back to the house.
Ned Schneebly has to get Dewey Finn, a friend of his, who has been staying in his place with no charge to pay up or he his getting dumped by his girlfriend
Dewey Finn has answered a call from the principle of a prestige prep school offering Ned a job as a substitute teacher role at the school. Dewey then pretends to be Ned and accepts the offer as he sees it as an opportunity to make cash.
Dewey Finn is shown round the school by Ms Mullins and then he is shown the class he is going to teach.
The students go to Ned's place to get Dewey to go to the concert because they still care for him as he was their best teacher. They then go to the battle of the bands.
Dewey and the band perform at battle of the bands and unfortunately they don't win but they don't mind because they enjoyed it