[s4e18] Hack-san -

: Alya takes on the mantle of Ladybug, proving her capability and swifteness as a temporary lead hero.

In the Miraculous: Tales of Ladybug & Cat Noir episode (Season 4, Episode 16—though often listed as Episode 18 in different regions), Marinette is forced to trust someone else with her Miraculous for the first time. Plot Summary [S4E18] Hack-San

: The villain uses a sentimonster virus (the eponymous "Hack-San") to manipulate technology, showcasing a more technical approach to his attacks. : Alya takes on the mantle of Ladybug,