Catalyst (Heroes' Day - Part 1)

"" is an episode of Season 2 of Miraculous: Tales of Ladybug & Cat Noir, and it is the first part of "Heroes' Day". Its world premiere was on October 21, 2018, in Switzerland for French viewers on RTS Deux.

Synopsis
Coming soon!

Plot
Coming soon!

Major characters

 * Marinette Dupain-Cheng/Ladybug
 * Adrien Agreste/Cat Noir
 * Alya Césaire/Rena Rouge
 * Nino Lahiffe/Carapace
 * Chloé Bourgeois/Queen Bee
 * Gabriel Agreste/Hawk Moth
 * Tikki
 * Plagg
 * Nooroo
 * Trixx
 * Wayzz
 * Pollen
 * Akuma
 * Nathalie Sancoeur/Catalyst

Minor characters

 * Tom Dupain
 * Sabine Cheng
 * Emilie Agreste (statue)
 * Adrien's bodyguard/Gorizilla
 * Lila Rossi/Volpina
 * Caline Bustier
 * Ivan Bruel/Stoneheart
 * Nathaniel Kurtzberg
 * Sabrina Raincomprix/Vanisher
 * Mylène Haprèle/Horrificator
 * Alix Kubdel/Timebreaker
 * Lê Chiến Kim/Dark Cupid
 * Max Kanté/Gamer
 * Rose Lavillant/Princess Fragrance
 * Juleka Couffaine
 * Ali (pictured)
 * Clara Contard
 * Mr. Damocles
 * André Bourgeois
 * Nadja Chamack/Prime Queen
 * Dark Ladybug (illusion)
 * August's mother (background)
 * Nora Césaire
 * Ella and Etta Césaire
 * Jagged Stone/Guitar Villain
 * Clara Nightingale/Frightningale
 * Fred Haprèle/The Mime
 * Wang Fu
 * Fang (dragon form)
 * Gigantitan
 * Glaciator
 * Animan
 * Civilians
 * Students

Trivia

 * Rena Rouge, Carapace and Queen Bee return in this episode to assist Ladybug and Cat Noir in their mission.
 * This also marks the instance where all superheroes appear at once.
 * Alya and Nino discover each other's superhero identities.
 * Akumatized villains from Season 1 and Season 2 returns in this episode but instead of their usual designs, they are themed red-colored.
 * This episode doesn't have an end card.
 * This episode has shown the most transformation sequences, having a total of six transformations, surpassing "Sapotis " and "Anansi", which only had three and "Queen Wasp", which only had four.
 * An alternate version of Alya's transformation sequence is shown when she transforms in her everyday attire.
 * The Lucky Charm and Miraculous Ladybug (superpower) are not used in this episode.
 * The Akuma creation and release sequences are altered to feature Nathalie standing behind Hawk Moth.
 * This episode shows Hawk Moth remove someone's powers for the first time.
 * This episode shows an Akuma self de-evilaization for the first time.
 * During Nino's transformation, Carapace's theme has a new theme compared to his transformation during "Anansi."

Errors

 * Alya's bangs are miscolored throughout the episode.

Catalyst (Der Heldentag - Teil 1) Catalizadora pt-br:Catalisadora (O Dia dos Heróis - Parte 1)