Mewtwo Returns is book based on the special of the same name. Written by Howard Dewin and published by Scholastic in 2002, in the middle of the book are screenshots from the movie.
This plot summary is incomplete. Please feel free to edit this plot summary to add missing sections and complete it.
Mewtwo just wants to live in peace. No such luck! Giovanni, head of Team Rocket, wants to take over the world — again! To do that, he'll need Mewtwo's psychic powers and he'll stop at nothing to get them — even destroying Mewtwo's friends. Now, Mewtwo must choose to fight back or join Team Rocket.
It's the ultimate battle of good vs. evil. Pokémon against Pokémon. Who will triumph?
In the movie, Mewtwo freed the clones by waving its hand over the Poké Balls they were imprisoned in. In the book, however, it picked up the Poké Balls and threw them one by one until all the clones had been freed.