Hector, Terrence, and Dee have always been curious about the quiet woman who scoops out their sloppy joes every afternoon. The Breakfast Bunch wonders what their Lunch Lady does when the school day ends and the cafeteria closes. They never could have guessed that behind her hairnet and yellow gloves, the Lunch Lady is actually a highly trained, secret crime fighter. While the students are busy with recess and spelling tests, she is busy keeping the school safe from hidden dangers. When the school's most popular teachers start acting strangely rigid and a little too perfect, the Lunch Lady suspects foul play. She soon uncovers a wicked plot to replace the entire teaching staff with robotic cyborg substitutes. Now, she must use all her coolest kitchen gadgets to serve up some serious justice and save the school from a high-tech takeover.