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". It's world premiere was on October 21, 2018, in Switzerland for French viewers on RTS Deux.

Synopsis
Coming soon!

Plot
After facing another supervillain late at night, Marinette and Adrien go home and fall asleep. However, they are soon awoken and reminded that it's Heroes' Day, a day where every Parisian has to do a good deed. Marinette panics since her time as Ladybug prevented her from preparing hers, but she is saved by Tom and Sabine, who give her a box of macarons to give to her classmates.

Meanwhile at the Agreste mansion, while getting ready for school, Adrien sees his father through his bedroom window staring at a stone statue of Emilie Agreste. When he goes downstairs, Nathalie tells Adrien that she booked the Chinese and fencing rooms for him as he requested. After Adrien leaves for school with his bodyguard, Nathalie goes to talk to Gabriel and tells him that it's time to implement his plan, pointing out how his target, Lila Rossi, has had months to ponder her anger over Ladybug. Gabriel asks Nathalie if she's really okay with helping him, to which Nathalie says that she'll always be there for Gabriel.

At school, Lila speaks to Miss Bustier's class through a video chat. She tells them that she is in the country of Prince Ali and had been invited by him to his palace. Marinette, aware of Lila's decietful nature, attempts to expose her lies by pointing out that Prince Ali is in the USA, but Lila says that Prince Ali wasn't actually with them. Marinette vows to herself that she'll expose Lila's lies one day, but Alya, who overhears, believes that Marinette is just jealous because Lila had once tried to date Adrien. When asked by Miss Bustier what she prepared for Heroes' Day, Lila says that she has received permission from other countries to work on a project to reduce pollution and is meeting with Prince Ali to get his approval. She then claims that she has to go because it is getting late where she is. Once she hangs up, it is revealed that she actually still lives in Paris and is hiding in her room. When her mother comes in and asks who she was talking to, Lila says she was talking to her boyfriend Adrien. Lila's mother also asks her about the school, to which Lila claims is closed from all the akuma attacks. Lila's mother then receives a call from Mr. Damocles, but Lila convinces her not to answer it since he's probably been akumatized. Miss Bustier tells the class that even if they don't have Prince Ali as a friend, there are other ways to do good deeds. Mr. Damocles bursts into the room dressed as The Owl and talks about how Ladybug and Cat Noir have saved Paris from Hawk Moth. He then asks everyone what heroic deeds they're doing. Nino says that he will be playing music for the retirement home. Adrien says that he will give a Chinese lesson to his fencing class and a fencing class to his Chinese class. Alya says that she has met with the mayor to discuss building handicap facilities. Hearing everyone's good deeds makes it hard for Marinette to admit that all she did was bring macarons for the class. Chloé mocks Marinette for doing so little, but Alya defends her by saying that it's better than nothing. Angry that Alya would imply that she didn't prepare anything, Chloé says that since she is a superhero, she is offering her autograph to anyone who wants it. However, Marinette still feels embarrassed by nothing having much done, so she tells the class that she is organizing a party for the whole school with lots of treats. Once home, Marinette asks her father for help in making the treats, but he cannot since he has to finish baking a giant Ladybug treat for the mayor. Sabine advises Marinette to just be honest with her classmates, but Marinette decides to make the treats herself instead. Meanwhile in her room, Lila angrily scrolls through a bunch of news feed about Ladybug until coming across an interview with Gabriel and Nadja Chamack. In it, Gabriel announces that he is funding a movie about Ladybug and calls her a true superhero, unlike the vulgar copy Volpina. The comment about Volpina angers Lila so much that she throws her laptop against the wall and screams in rage. In his lair with Nathalie, Gabriel transforms into Hawk Moth and sends an akuma out to Lila. It infects her bracelet and Hawk Moth offers her the power of illusion to ruin Ladybug's reputation. Lila accepts and transforms into Volpina.

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/Scarlet Hawk Moth
 * Tikki
 * Plagg
 * Akuma
 * Nathalie Sancoeur/Catalyst
 * Lila Rossi/Volpina

Minor characters

 * Tom Dupain
 * Sabine Cheng
 * Emilie Agreste (statue and pictured)
 * Adrien's bodyguard/Gorizilla
 * 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)
 * Lila's mother
 * Nooroo
 * 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
 * Trixx
 * Wayzz
 * Pollen
 * Fang (dragon form)
 * Gigantitan
 * Glaciator
 * Animan (Tyrannosaurus form)
 * Rogercop
 * Civilians
 * Students

Trivia

 * This episode reveals that, aside from Adrien and Marinette, no one knows about Lila's compulsive lying.
 * This episode shows Hawk Moth removing someone's powers, for the first time.
 * This episode shows an akuma leaving its host without Ladybug destroying an object or purifying said akuma.
 * Akumatized villains from Season 1 and Season 2 return in this episode, but their designs are colored red.
 * Those that have been reakumatized are: Volpina (however it is unknown if she gets reakumatized in "Mayura" after Hawk Moth recalled her akuma), Prime Queen, Guitar Villain, Frightningale, Horrificator, Stoneheart, Gamer, Princess Fragrance, Gorizilla, Dark Cupid, The Mime, Timebreaker, Vanisher, Animan, Rogercop, Gigantitan, and Glaciator.
 * This is the second time Plagg uses Cataclysm.
 * He seems to be proud of the fact he learned to control it better, thus keeping the damage to a minimum.
 * 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.
 * With this, all Miraculous users introduced up to this point transform in a single episode.
 * A new version of Alya's transformation sequence is shown when she transforms in her everyday attire.
 * Also Rena Rouge's eyelids are now black whenever she blinks as opposed to "Sapotis" where her eyelids remain uncolored.
 * During Nino's transformation, Carapace's theme changed, compared to his transformation during "Anansi."
 * Nino discovers Alya's superhero identity, and her knowledge of his, which she appeared to gain in "Anansi", is confirmed.
 * Rena Rouge, Carapace and Queen Bee return in this episode to assist Ladybug and Cat Noir in their mission.
 * This also marks the first instance where all superheroes appear at once.
 * The Lucky Charm and Miraculous Ladybug are not used in this episode.
 * This the second time Ladybug didn't call on her Lucky Charm.
 * This is the first episode in which the main akumatized villain isn't defeated or cured.

Errors

 * Alya's bangs are miscolored throughout the episode.
 * Marinette doesn't have her earrings at one point when she's in the kitchen.
 * When Marinette is showing her father the list of treats for the party, her eyes are green instead of blue.
 * When Volpina gets deakumatized by Hawk Moth, the tips of her hair are brown instead of white.
 * Ladybug gives Cat Noir just the Bee Miraculous by itself, but when he gives it to Chloé, it's in the box.
 * Though Lila's mother is shown to be Clara Contard, it was said by Thomas Astruc to be an animation error.
 * When Rena Rouge transforms, her eyelids are normal. However, after the transformation, her eyelids turn black.

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