Following the events of "Destruction", Marinette and Adrien begin to doubt their roles as superheroes and the two start to reflect on the events that have transpired after the heroes have failed to get the stolen miraculouses back from Monarch and Cat Noir has accidentally injured the villain with his cataclysm. In Marinette's room, Marinette confides in Alya about her failure to save the kwamis from Monarch's grasp and she is unable to heal him after he escaped with her lucky charm. Alya tries to give Marinette some words of encouragement, but she transforms into Ubiquity. Marinette soon meets Betterfly, a heroic version of the butterfly miraculous holder from an alternate universe. Betterfly reveals to Marinette that he is seeking Ladybug and Cat Noir's help on stopping Shadybug and Claw Noir, the evil counterparts of the heroes, who use their miraculouses for villainous purposes and the two evil counterparts have also been recruited by the villainous Supreme.
—dawsonpersi