Captain Underpants and the Terrifying Return of Tippy Tinkletrousers (Captain Underpants #9) (9)

When we last saw George and Harold, they were headed to jail for the rest of their lives. What could be worse? How about being pulled from prison by a time-traveling tyrant named Tippy Tinkletrousers?!!? Now the boys are taking a trip back in time to the carefree days of kindergarten, when the scariest thing they had to face was not evil mad scientists or alien cafeteria ladies but a sixth-grade bully named Kipper Krupp, the nephew of their clueless school principal. And because George and Harold don't invent Captain Underpants until they're in fourth grade, the clever kindergartners are on their own. Will their brains be enough to beat the bully?!!?

• Captain Underpants and the Revolting Revenge of the Radioactive Robo-Boxers (Captain Underpants #10)
• Captain Underpants and the Tyrannical Retaliation of the Turbo Toilet 2000 (Captain Underpants #11)
• Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot (Captain Underpants #12)
• Captain Underpants And The Preposterous Plight Of The Purple Potty People
• Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part 2: The Revenge of the Ridiculous Robo-Boogers (Captain Underpants #7): Color Edition
• Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part 1: The Night of the Nasty Nostril Nuggets (Captain Underpants #6)
• Captain Underpants and the Preposterous Plight of the Purple Potty People: Color Edition (Captain Underpants #8)
• Captain Underpants and the Perilous Plot of Professor Poopypants: Color Edition (Captain Underpants #4)
• Captain Underpants and the Wrath of the Wicked Wedgie Woman: Color Edition (Captain Underpants #5)
• Captain Underpants and the Invasion of the Incredibly Naughty Cafeteria Ladies From Outer Space: Color Edition (Captain Underpants #3): (And the ... of the Equally Evil Lunchroom Zombie Nerds)