By daylight, Marinette Dupain-Cheng and Adrien Agreste are ordinary teenagers. But unbeknownst to their family and friends, the two of them carry a huge secret...using the powers of magical creatures called Kwami, they transform into the superheroes Ladybug and Cat Noir! With a mission to protect the city of Paris from the evil Hawk Moth, the two of them must learn to cope with their new responsibilities, as well as ordinary troubles involving love, school, family, and friends. Most of all, they must learn to put their romantic feelings aside in order to perform their duty, unaware of each other's true identities.

Marinette's class is headed to New York, the city of superheroes, for French American Friendship Week, but the American superheroes may find themselves in need of help while there.

在得知艾俊去上海后，马丽娜借着给舅公送生日礼物的机会也来到了上海。可刚到上海，马丽娜的手机、米可幻奇以及精灵宝奇都被偷走了！束手无策的她接受了一个名叫飞儿的女孩的帮助，殊不知就是飞儿偷走了她的东西。她们一起对抗贪财的钞票张，愤怒的他被黑魔蝶黑化了。原来黑魔蝶特意来上海抢夺魔法珠宝“普洛幻奇”。飞儿在普洛幻奇的加持下变身成为超级英雄“仁人”，可满脑子只为复仇的她违背了魔法超能力所要求的品质，导致普洛幻奇的守护者被黑化成为阎罗狮，就连黑魔蝶和黑猫罗尔都被他消灭了！只剩下失去搭档的奇迹少女和失意的仁人来对抗这个超强反派。她们能否解开彼此的心结？飞儿是否可以放下心中的仇恨成为称职的新英雄？