Ladybug and Cat Noir discover that there is a parallel world where the holders of the Miraculous of the Ladybug and the Black Cat are evil while the holder of the Miraculous of the Butterfly is a hero ...

Because their powers are so similar, but Shadybug and Claw Noir’s Miraculouses ... to prevent the world from destruction. As luck would have it, the newest Butterfly Miraculous Holder, Chrysalis ...