
Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies From Outer Space is the third Captain Underpants book by Dav Pilkey. In this book, George and Harold play a prank on the lunch ladies that makes them angry and causes them to quit. Three aliens then dress up as human women and get hired as their replacements. They feed all the kids evil zombie juice, turning them into zombies that they will help them to take over the world.