Bart is seen vandalizing the school and is caught by Principal Skinner. He is forced to stay after school as punishment, and do the chalkboard thing. Bart believes Principal Skinner is abusing his power, and he was overly punished. Bart wants revenge, so he build an army. After some training, the child army attacks the school, and it forces Principal Skinner to cower in a classroom. But Bart finds him and laughs. After playing with Skinner a bit, Bart finishes his revenge, he shoots Principal Skinner, and all of the merciless children gather around him to laugh as he writhes in pain. How embarrassing, Bart's revenge is complete.