A review by bookdingo
Captain Underpants and the Big Bad Battle of the Bionic Booger Boy, Part 2: Revenge of the Ridiculous Robo-Boogers by Dav Pilkey

4.0

Nat is having me read these entirely out of order, so it's almost like reading a mystery series - "Oh, THAT'S the origin of that monster" or "OH, now I see why this character wasn't around."