Ricky Ricotta's Mighty Robot vs. the Mecha-Mo- 0545630126, Dav Pilkey, paperback

Ricky Ricotta's Mighty Robot vs. The Mecha-Monkeys From Mars - VERY GOOD

Ricky Ricotta's Mighty Robot vs. The Uranium Unicorns From Uranus - VERY GOOD

Ricky Ricotta's Mighty Robot vs. The Stupid Stinkbugs from Saturn - VERY GOOD

Ricky Ricotta's Mighty Robot vs. The Jurassic Jackrabbits From Jupi - VERY GOOD

Ricky Ricotta's Mighty Robot vs. the Mecha-Monkeys from Mars (Ricky Ricotta's Mi

Ricky Ricotta's Mighty Robot vs. The Mutant Mosquitoes From Merc - VERY GOOD