Quick recap
The scientist who created Mewtwo from Mew's DNA loses control of the creature, which wrecks the lab. Giovanni tries to use Mewtwo as a weapon, and it escapes, furious at humans. Later, Mewtwo lures strong Trainers to New Island, Ash, Misty and Brock included, takes their Pokémon and makes stronger clones. Mew shows up and the two start an endless fight, with originals and clones hurting each other. Ash leaps between their attacks and is turned to stone. The Pokémon's tears bring him back. Mewtwo realizes that how you're born doesn't define you, erases everyone's memory and leaves with the clones.

