Ricky Ricotta's Mighty Robot Vs. the Mecha-monkeys from Mars (Ricky Ricotta, 4, Band 4) - Hardcover

In this fourth illustrated adventure novel from bestseller Dav Pilkey, a small mouse named Ricky Ricotta and his best friend, a giant flying Robot, save the world from mean Major Monkey.

Ricky Ricotta and his Mighty Robot are in big trouble. After
crashing the Ricotta family mini-van while using it as a skateboard (it's the only thing big enough for the Robot), they have to earn some money fast to pay for the repairs. While they're thinking about how on EARTH they're going to come up with the money...on MARS, mean Major Monkey is making plans to enslave mousekind! Major Monkey has had his eye on earth for some time now...and he's noticed that all the evil villains who have tried to conquer the planet keep getting foiled by Ricky Ricotta's Mighty Robot. So the first thing to do is get rid of that Robot! Major Monkey tricks Ricky's Robot into going to Mars. Now it's up to Ricky to rescue his Robot and defat Major Monkey.