Captain Underpants's Spookiest - And Stretchiest - Adventure Yet!george Beard And Harold Hutchins Are Back In A New Halloween Adventure! Piqua's Biggest Pranksters Are Getting Ready For The Best Holiday Ever - Halloween, Of Course. But Their Dreams Of Costumes, Candy, And Haunted Houses Go Down The Drain When Mr. Krupp And Melvin Start A Campaign To Make Halloween Illegal!that's When George And Harold Come Up With Hack-A-ween, A Totally Legal Spin-Off Of Halloween. But Will Disguises, Hack-O'-lanterns, And Sneak Or Snacking Fill The Pumpkin-Shaped Holes In Their Lives? Find Out In This Young Graphic Novel Based On The \"Hack-A-ween\" Episode Of The Hit Netflix Show.