During a school field trip, Ladybug and Cat Noir meet the American superheroes, whom they have to save from an akumatised super-villain. They discover that Miraculous exist in the United States too.

Marinette and Adrien, two normal teens, transform into superheroes Ladybug and Cat Noir when an evil threatens their city.

When Paris is in peril, Marinette becomes Ladybug. Little does she know, her school crush Adrien is actually Cat Noir, another city-saving superhero.