What's New, Scooby-Doo? (2002)

S02E01 Big Appetite in Little Tokyo

Velma triumphs at the science fair with her innovative Dogbot, earning her a trip to Tokyo. However, while they are in the bustling city, Shaggy finds himself cursed to transform into a massive monster during his slumber. As the gang navigates the vibrant streets of Tokyo, they must uncover the mystery behind the curse and find a way to reverse it before Shaggy's transformation wreaks havoc.