Ricky Ricotta's Mighty Robot vs. the Mecha-Monkeys from Mars (Ricky Ricotta Series #4)

From Dav Pilkey, creator of Captain Underpants, and acclaimed artist Dan Santat, an out-of-this-world friendship adventure with all-new full-color illustrations!

Ricky Ricotta is lucky to have his Mighty Robot as a best friend. They play, study, and even get in trouble together, and they always watch out for each other. That's what friends are for! In this book, Ricky and his Mighty Robot meet a mean little Martian named Major Monkey who plans to take over Earth with his monstrous Mecha-Mo…