Once every thousand years, the incredible Sea Dragon reappears! It is said that the first person it lays eyes upon will become its master and be able to control its extraordinary powers. The time has come: the Sea Dragon is about to return at any moment! Master Fox wishes to use the Sea Dragon's powers to reign over the Squirming Archipelago. But he will need the help of his servant, the cowardly and naive cat Menji. But others are also searching for the legendary Sea Dragon... and they will stop at nothing to get there first!

At last! The long-awaited moment has come: the Sea Dragon has awoken! And much to everyone's consternation, it was that good-for-nothing Menji—with the help of his friends Xitli and Nara—who got to the strange creature first. But our young feline friend is not in the clear just yet! The formidable emperor Raana IV is hell-bent on capturing the dragon and using its powers to consolidate his control over the archipelago. And that's not all! Menji's former master, Fox, is looking to take revenge on his old apprentice.