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Ricky Ricotta's Mighty Robot vs the Stupid Stinkbugs from Saturnthe sixth robot adventure novelBookby Pilkey, Dav, 1966-
Published 2003 -
Ricky Ricotta's giant robot vs the mutant mosquitos from Mercurythe second robot adventure novelBookby Pilkey, Dav, 1966-
Published 2000 -
by Pilkey, Dav, 1966-
Published 1999 -
Captain Underpants and the big bad battle of the Bionic Booger BoyPart 2 The revenge of the ridiculous Robo-BoogersBookby Pilkey, Dav, 1966-
Published 2019 -
Captain Underpants and the preposterous plight of the purple potty peoplethe eighth epic novelBookby Pilkey, Dav, 1966-
Published 2006