The adventure explodes into action with the debut of Mewtwo, a bio-engineered Pokémon created from the DNA of Mew, the rarest of all Pokémon. Determined to prove its superiority, Mewtwo lures Ash, Pikachu and the others into a Pokémon match like none before. Mewtwo vs. Mew, Super-clones vs. Pokémon. It's the ultimate showdown... with the very future of the world at stake!