While on a journey to become a Pokémon Master, Satoshi and his friends receive a special invitation. However, what they don't know is that this invitation is really a trap planned by Mewtwo! Satoshi and his friends cross the ocean during a terrific storm to reach the "Pokémon Castle" where they're greeted by Mewtwo, a Pokémon who claims to be both the world's strongest Pokémon and the world's strongest Pokémon Trainer! Mewtwo plans to capture everyone's Pokémon and use them to make superior Copies in a plan to get revenge against humans everywhere.