Attack of the 50-Foot Fly Guy! by Tedd Arnold (Fly Guy #19) Hardcover

Buzz comes home from school to find that Fly Guy is 50 feet tall! WOW-ZAA!

 

After grabbing a snack from a radioactive trash can, Fly Guy grows to 50 feet tall! Can Buzz and the scientist figure out how to shrink him before the police and military attack?