Seth -- Brave, confident, and creative, he's the team leader of a group of animated teenagers. Teleported from his own world, Seth gets a little acquainted with his new home in the cartoon world, but when trouble looms in, he's never afraid of a challenge - big or small. He is the very first Cartoonster in the story, chosen to not only protect the Tooniverse, a universe where toons live together in harmony, but also save his own world, the Real World, from the takeover of an evil cartoon villain syndicate! But in order to do that, he needs a team! With help from new toon allies like SpongeBob SquarePants and Cricket Greens, he sets off to make some new friends.