The PTA Disbands!.Edna Krabappel calls a strike to protest against Principal Skinner's low spending on Springfield Elementary School. Bart fuels the strike by repeatedly turning the teachers against Skinner. The parents of Springfield eventually decide to take matters into their own hands, and recruit volunteers from the community to take over as temporary teachers. After several failed substitutes, Marge becomes Bart's teacher. Bart grudgingly decides to resolve the strike, and locks both Krabappel and Skinner in Skinner's office. The experience inspires them to rent out the school cloakrooms to Springfield Prison, in order to earn more money.