High Quality Content by WIKIPEDIA articles! "The PTA Disbands" is the 21st episode of The Simpsons` sixth season. It originally aired on April 16, 1995. In the episode, Edna Krabappel calls an emergency strike on behalf of the Teachers` Union of Springfield Elementary, to protest against Principal Skinner`s miserly school spending. Students react in their own manner to the strike: Lisa becomes obsessed with a desire to be graded, while Bart enjoys the extra time he has during the day. Bart arranges to keep the teachers union and Principal Skinner at an impasse, but becomes frustrated with substitute teacher arrangements and resolves to force negotiations forward. The situation is resolved when Krabappel and Skinner agree to rent space in classroom closets to the Springfield Prison.