Mrs. Krabappel is a fictional character from the animated television series, The Simpsons. She is a fourth-grade teacher at Springfield Elementary School and is known for her sarcastic humor and no-nonsense attitude. Her character is voiced by the late Marcia Wallace, who brought a unique charm to the role. In the show, Mrs. Krabappel often deals with the challenges of teaching a class that includes students like Bart Simpson. Despite her frustrations, she cares about her students and tries to help them succeed. Her character has become a beloved part of the series since her introduction in 1990.