While our heroes are exploring Reflection Cave, named for its mirrorlike crystal walls, Ash’s own reflection pulls Pikachu through one of the mirrors! Ash leaps after it and finds himself in another world, with a Clemont, Bonnie, and Serena very different from the ones he knows.
After our Ash helps Mirror Ash drive off Team Rocket and reclaim his own Pikachu, Mirror Clemont tells him of a frightening legend—people who pass through one of the mirrors in Reflection Cave must return to their own world before sunset or risk being stuck on the wrong side of the mirror forever! Ash hurries back to the mirror he first stepped through, where his friends are waiting on the other side, and all of them focus on reuniting with each other.
Thanks to the strong bonds of friendship, Ash and Pikachu are pulled back to their own world just in time!