Ricky Ricotta is lucky to have his Mighty Robot as a best friend. They play- they 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 Mighty Robot meet a mean little Martian named Major Monkey- who plans to take over earth with his monstrous Mecha-Monkeys. Now it's up to Ricky to rescue his friend and stop Major from menacing mousekind!