Ricky Ricotta's mighty robot vs. the Uranium Unicorns from Uranus - Dav Pilkey

From the creator of CAPTAIN UNDERPANTS, comes an out-of-this-world
friendship adventure - now in full colour!
Ricky Ricotta loves his Mighty Robot, but sometimes it's hard for
a little mouse to have a best friend who's so BIG. One night, Ricky
makes a wish: if only his Mighty Robot had a friend his own size.
Little does Ricky know, his wish is about to come true. Evil
Uncle Unicorn has travelled all the way from Uranus with a mean
and nasty plan. He's built a giant Ladybot to trick the Mighty Robot
so he can take over planet Earth. Once again, it's up to Ricky
and his pals to save the day.