Captain Underpants (#3) And The Invasion Of The Incredibly Naughty Cafeteria Ladies From Outer Space (P)

(And The Subsequent Assault Of The Equally Evil Lunchroom Zombie Nerds) 

The brave Captain is really just crabby old Principal Krupp, hypnotized into becoming the world's greatest superhero every time someone snaps their fingers. And of course you know the trouble-making hypnotists are none other than Jerome Horwitz Elementary School's two most notorious tricksters, George and Harold ("We rule!" "Me, too!").
Well, George and Harold--surprise, surprise--are at it again. The cranky lunch ladies quit after George and Harold fool them into baking super-volcanic krispy kupcakes that flood the school with gigantic green globs o' goo. Mr. Krupp finds replacements and fast, but he unwittingly hires the tentacled alien trio of Zorx, Klax, and Jennifer in disguise! Will they turn everyone in school into evil zombie nerds? Can George and Harold save the world before it's too late? All seems lost until the diabolical Zorx snaps his... um, tentacles in front of Mr. Krupp, and the power of wedgies comes to the rescue once again.