Bart Simpson gets a stomachache after accidentally eating a jagged metal Krusty-O with his breakfast cereal. Lisa is the only one who believes him, however. Homer and Marge send him to school anyway. Bart struggles through the test. After finally convincing Mrs. Krabappel that he is actually ill, she lets him go and see the nurse. Bart collapses on the medical room floor. He is then taken to Springfield General Hospital where he undergoes surgery from Dr. Hibbert and Dr. Nick. It seems Bart has appendicitis.