What's New Scooby-Doo? - Season 02

In season 2 opener, after Velma wins a contest for the best invention, the gang travels to Tokyo, Japan. When a mystical person zaps a pizza with a monster-transformation spell, Shaggy eats it. Shaggy starts to grow into a Godzilla-like monster whenever he goes to sleep and he starts eating everything in sight. Now the gang is running around Tokyo trying to get away from the police who want to capture Shaggy.