Ricky Ricotta's Mighty Robot vs. the Uranium Unicorns from Uranus (Book 7) by Dav Pilkey
From Dav Pilkey, creator of Captain Underpants, and acclaimed artist Dan Santat, an out-of-this-world friendship adventure with all-new full-colour illustrations and mini-comics throughout!Ricky Ricotta loves his Mighty Robot, but sometimes it's hard having a best friend who is so BIG! If only his Mighty Robot had someone his own size to play with, Ricky could have some fun by himself. Little does Ricky know, his wish is about to come true. Ugly Uncle Unicorn is hatching a hideous plan to take over Earth, and he's got a supersized surprise for Ricky and his Robot friend!Originally published in 2000, this edition features brand-new full-colour illustrations throughout!