30 Foot Shaggy was a green, scaly, enlarged version of Shaggy Rogers. He looks like a cross between Shaggy and Godzilla, which is intentional as he is a Godzilla parody.
It was a tall, green and scaly humaniod beast resembling Shaggy.
It constantly destroyed things, as if they were insignificant items.
Powers and abilities
It was extremely strong.
What's New, Scooby-Doo?
Shaggy was supposedly cursed after eating a pizza with a transformation spell cast on it. Shaggy started to grow into a Godzilla-esque creature every time he went to sleep and he starts eating everything in sight. The gang had to run from the Tokyo police because of this, as they wanted to capture the 30 Foot Shaggy.
Even though this was a classic "guy in a mask" scenario, the curse looked real because the real villain had the aid of Dogbot (a robot dog of Velma Dinkley's creation). Dogbot would chew through Shaggy's chains while he was sleeping to make it seem as if he had turned into 30 Foot Shaggy. (Big Appetite in Little Tokyo)