Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies from Outer Space (and the Subsequent Assault of the Equally Evil Luchroom Zombie Nerds)

This story has the longest children literature title in recent history. Well, to tell a long story short, George and Harold make angry the cafeteria stuff, the luch ladies. 

Meanwhile, three outer space conquerors try to... conquer Earth by making a legion of nerd zombies of the people that eat at the cafeteria where they supplanted the luch ladies.

The situation is critic and in the fight George and Harold sustained with the aliens, one of them snap their... tentacles and Captain Underpants is on again.

He fights the nerd zombies, the aliens and a giant flesh-eater plant. In the end, a brick of anti-zombi juice turns everyone to normal. Captain Underpants wins again.

More about Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies from Outer Space (and the Subsequent Assault of the Equally Evil Luchroom Zombie Nerds) (Uff!):

• Dav Pilkey's page.
• The book in the page of the author.
• Wikipedia

Image taken from Wikipedia