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 may be a small mouse, but he has a VERY big friend -- a giant flying Robot! And when an evil, outerspace villain named Mr. Mosquito invades Earth with an army of Mutant Mosquitoes from Mercury, Ricky and his Robot know exactly what to do! Young readers will cheer as Ricky's Robot battles the bad guys. And when Ricky finds a very smart way to play a trick on Mr. Mosquito, it's plain to see that even a little mouse can be a BIG hero!

Originally published in 2000, this edition features brand-new full-color illustrations and mini-comics throughout!