Wonder World is the home planet of Turbo Thunder. Everyone in this world has super powers. Turbo Thunder lived with his parents happily until the Darkness appeared. The inhabitants attacked the Darkness with rockets, so in turn, it sended the Eliminators to attack the planet. During the attack the parents of Turbo Thunder were absorbed by the Darkness, after they sent Turbo Thunder to the space. The whole planet was absorbed by the Darkness. It is unknown if the planet was restored after the Darkness was defeated, but it likely was considering how the Darkness coughed out all the other planets it had swallowed in the movie and Thunder World.
Turbo Thunder himself as seen at the end of Part 1: The Big Beginning.