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Bart Gets a 'Z' is the second episode of Season 21, which aired on October 4, 2009. The episode was written by Matt Selman, and directed by Mark Kirkland. When Mrs Krabappel confiscates her students' mobile phones, they hatch a plan to get their teacher drunk to get revenge. When Principal Skinner fires her, she is replaced by a cool new teacher, Zachary Vaughn, who impresses the kids with his love of texting, Facebook and Twitter. Bart has a lingering guilt about getting Edna fired, and tries to help her. With the assistance of a self-help book-slash-DVD, she opens her own muffin store - but she still longs to be a teacher.
Plot
Bart and his classmates get their cellphones confiscated by Mrs Krabappel for using them in class. At a meeting in Bart's house, the students realise that Homer is always fun to be around when he's drunk so they decide to get Mrs Krabappel drunk. Each student steals some alcohol from their parents and puts it in Mrs Krabappel's coffee. After Mrs Krabappel gets drunk she makes a scene and gets fired. Bart and Milhouse buy a book called "The Answer". Following the instructions of the book, Bart and Mrs Krabappel build a Muffin store called Edna's Edibles. That's when Bart confesses that he was the one who put alcohol in Mrs Krabappel's coffee. Mrs Krabappel is angry with Bart and leaves.
Meanwhile, at Springfield Elementary, a new teacher called Zachary Vaughn teaches Bart's class and gives everyone their cellphones back, everyone loves him, except Bart. He still misses Mrs Krabappel. Bart was going to put alcohol in Zachary's drink as well but backs out at the last second and decides to tell Principal Skinner instead. While he is confessing he and Skinner hear someone yelling in the hallway. It was Zachary, who got drunk by himself, Willie takes him away and Mrs Krabappel gets her job back.
