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|“||Hawk Moth, I give you the power to release as many akumas as you desire. From now on, you are the almighty Scarlet Moth.||”|
—Catalyst, "Catalyst (Heroes' Day - Part 1)"
"Catalyst (Heroes' Day - Part 1)" is the twenty-fifth episode of Season 2 of Miraculous: Tales of Ladybug & Cat Noir, and it is the first part of "Heroes' Day". Its U.S. premiere was on December 14, 2018 (at 12:00 PST) on Netflix.
After facing another supervillain late at night, Marinette and Adrien go home and fall asleep. However, they are soon awoken only seconds later and reminded that it's Heroes' Day, a day where every Parisian has to do a good deed in honor of their superheroes. 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. As he goes downstairs, Nathalie tells Adrien that she booked the Chinese and fencing rooms for him as he requested and reminds him that he much also make an appearance at the Agreste Foundations Heroes Day Gala. 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 and it will be peaked now that everyone is celebrating her on Heroes Day. 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 deceitful 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 has 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. The two are then interrupted by the noise of the ongoing Heroes' Day Parade, which irritates Lila.
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 lesson 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 one. However, Marinette still feels embarrassed by not having much done, so she tells the class that she is organizing a party for the whole school with countless amounts of pastries.
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.
Nathalie and Gabriel wait inside the lair for the first part of their plan to unfold. 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 in Ladybug's honor due to her saving him and his son countless times. After he says that Volpina is a false hero in comparison to Ladybug, Lila becomes enraged and flings her laptop against the wall. With her negative emotions hitting their peak, Gabriel transforms into Hawk Moth and sends an akuma to Lila. It infects her wristbands and Hawk Moth offers her the power of illusion once more. Lila agrees and she is transformed back into Volpina.
With her illusionary powers, Volpina sends an illusion from up on the Eiffel Tower: an akumatized Ladybug with inverted colors and Cat Noir appear on a Ladybug float.
"Akumatized Ladybug" and "Cat Noir" are fighting, with the latter warning everyone to stay back from his possessed friend. The two of them fight briefly, with one of the news reporters recording the battle. "Akumatized Ladybug" tells "Cat Noir" to give her his Miraculous to Hawk Moth but "Cat Noir" tells her if Hawk Moth wants a ring he can make one himself. "Akumatized Ladybug" tells him that it is not nice to deny a request of a friend from a friend. "Cat Noir" tells her that they won't probably be friends again until she is deakumatized. "Akumatized Ladybug" traps "Cat Noir's" hand in her yo-yo. Just then, "Cat Noir" summons his Cataclysm and attempts to use it on the yo-yo to stop her. However, "Ladybug" is too fast and pulls him towards herself and she plants his hand on his own chest: "Cat Noir" disintegrates into black dust, which shocks everyone dearly. "Akumatized Ladybug" picks up Cat Noir's ring and announces that she will give it to Hawk Moth.
With the people of Paris drowning in despair, Hawk Moth seizes his opportunity to continue the second part of the plan. He deakumatizes Lila and then creates another akuma in his lair for Nathalie. It infects her tablet and transforms her into Catalyst, a supervillain who has the ability to multiply Hawk Moth's akuma corruption power to create as many akumas as he wishes. Catalyst infuses Hawk Moth's cane with energy, which transforms him into Scarlet Moth. With his boosted powers, Scarlet Moth sends a swarm of akumas all over the city.
Marinette, who is at home, continues to attempt to create her Heroes' Day pastries deed as she promised her classmates but has trouble with the task. She pleads with Tikki to let her transform into Ladybug and use her Lucky Charm to help her with her task but soon realizes that she can't use her powers for her own personal needs. Tikki encourages Marinette to just be honest with her classmates, but Marinette is worried about ruining the party. However, Tikki assures her that nothing can ruin the party on Heroes' Day.
Marinette returns to school, dreading returning to disappoint everyone, just as Adrien catches up to her and tells her he will be able to come to her pastry tasting. Noticing how nervous Marinette looks, Adrien fears that Marinette doesn't have enough food for him, but Marinette assures him that she does. Once inside the building, the two find themselves in bigger problems, as numerous students have seen the illusion fight between the "akumatized Ladybug" and "Cat Noir". In the middle of a live interview between Nadja Chamack, Jagged Stone, and Clara Nightingale, the three are akumatized back to their akumatized selves just as numerous red akumas descend on the school and also akumatize other students and staff back into their akumatized selves. Adrien saves himself and Marinette from akumatization. Chloé tells everyone not to panic as she knows what to do and rushes home. Marinette realizes that the akumas are infecting those who are afraid and warns the other students not to show fear. Juleka is nearly akumatized but after hearing Marinette's warning, she calms down. Alya and Nino also comfort one another to prevent themselves from being afraid. Alya then calls her sister Nora and tells her not to be afraid, but Nora confidently tells Alya that fear is afraid of her as she smashes a bunch of akumas with a broomstick while their younger sisters cheer her on. Meanwhile, Marinette runs into the bathroom to transform into Ladybug and heads straight to Master Fu for additional help.
Adrien tries to find a place to transform but is soon captured by his bodyguard, who has turned back into Gorizilla. By Scarlet Moth's command, he forces him to keep Adrien safe while instructing Sabrina, now Vanisher once again, to follow Ladybug to Master Wang Fu. As Gorizilla takes Adrien away from the battle, Plagg sneaks behind the villain and blows on the ground, causing it to crack and making Gorizilla trip and drop Adrien. Once he gets away from him, Adrien transforms into Cat Noir.
Meanwhile, a suspicious Ladybug realizes that she's being followed and ducks inside of a sewer. She sees Vanisher's footprints in the water, uses her yo-yo to tie her up, and then purifies her akuma, turning her back into Sabrina. Sabrina is delighted upon seeing the real Ladybug and promises to tell everyone the truth while Ladybug heads over to Master Fu. Once there, Master Fu voices how much he's feared the day Hawk Moth would realized how much power he actually has and then takes out the Miracle Box for Marinette to choose a trusted ally to help her. Tikki advises Marinette to take all the Miraculouses, but Marinette points out that she won't have time to explain to everyone what to do and says that she needs allies that already know what to do. She picks up the Fox Miraculous for Alya, Bee Miraculous for Chloé, and Turtle Miraculous for Nino.
Afterwards, she gets a call from Cat Noir informing her that there are many villains and that Hawk Moth overdid himself. Then, he is approached by the heroine expecting him to do the same thing and is given the Bee Miraculous. Meanwhile, Ladybug finds Alya and Nino hidden back in the school's lockers. Lacking a good excuse to separate them, she gives them their respective Miraculouses, revealing their superhero identities to each other. Nino is surprised that Alya is Rena Rouge and even more surprised that she never told him, but Trixx reminds him that a superhero must keep their identity secret before Alya transforms into Rena Rouge. Nino is impressed but wonders why Alya is not surprised that he is Carapace. She merely tells him to transform. After he and Wayzz greet each other with a handshake, Nino transforms into Carapace.
Chloé, in the meantime, has set up a "Bee Signal", somehow unconvinced of the parade fight. Cat Noir shows up and Chloé is annoyed that Ladybug send over her "second fiddle". But when Cat Noir threatens to find another Queen Bee, Chloé takes back that comment and tells him to give her the Miraculous. Cat Noir coerces Chloé to ask for it politely before giving it to her. After being greeted by Pollen, Chloé transforms into Queen Bee.
With all five heroes united, they all arrive at the Trocadéro, where Queen Bee asks why they are waiting, with the akuma army nearby at the Eiffel Tower. Ladybug retorts she wants to wait to see what they are planning, just as Scarlet Moth arrives, apparently out of his lair, with Catalyst remaining behind. He broadcasts himself on TV and asks Ladybug and Cat Noir how they plan to fight his massive army. As the heroes bicker how they will approach the fight, Cat Noir asks Ladybug what her plan is while she looks onward wordlessly.
- Marinette Dupain-Cheng/Ladybug/Miss Fortune (Akumatized Ladybug (illusion))
- Adrien Agreste/Cat Noir
- Nino Lahiffe/Carapace
- Alya Césaire/Rena Rouge
- Chloé Bourgeois/Queen Bee
- Gabriel Agreste/Hawk Moth/Scarlet Moth
- Akuma/Scarlet Akumas
- Nathalie Sancoeur/Catalyst
- Lila Rossi/Volpina
- This episode reveals that Adrien and Marinette are the only ones who know about Lila's habitual lying.
- This episode confirms that a person can be akumatized into the same supervillain again, even though the akumatized object might be different.
- Akumatized Ladybug shares the same color-inverted costume as the titular villain from "Antibug".
- 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. This is also the first time the affected has not shown signs of confusion or fatigue.
- Akumatized villains from Season 1 and Season 2 return in this episode, but their designs are colored red due to Scarlet Moth's power.
- Those that have been reakumatized are: Volpina, Prime Queen, Guitar Villain, Frightningale, Horrificator, Stoneheart, Gamer, Princess Fragrance, Gorizilla, Dark Cupid, the Mime, Timebreaker, Vanisher, Gigantitan, Glaciator, Animan, Riposte, the Pharaoh, Rogercop, and Stormy Weather.
- Rena Rouge, Carapace, and Queen Bee return in this episode to assist Ladybug and Cat Noir in their mission. This marks the first instance where all superheroes appear at once.
- This episode includes the most transformation sequences, with a total of six transformations, surpassing "Sapotis" and "Anansi", which had only three, and "Queen Wasp", which had only 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.
- A new effect has also been added in Alya’s transformation.
- During Nino's transformation, Carapace's theme is changed from his transformation during "Anansi".
- Nino discovers Alya's superhero identity, and her knowledge of his, which she appeared to gain in "Anansi", is confirmed.
- The Miraculous Ladybug and Lucky Charm are not used in this episode, the latter for the first time.
- This is the first episode in which the main akumatized villain isn't defeated or cured by Ladybug.
- For the first time in the series, Hawk Moth leaves his lair while he is transformed.
- Chloé's bee signal is a reference to the Bat-Signal.
- The animation for the scene where Plagg offers Adrien his cheese while the two are in his bathroom is reused from "The Bubbler" but this time, the cheese doesn't have the red ribbon.
- Although many countries have a holiday called "Heroes' Day" (most commemorating specific people), France is not actually one of them.
- Adrien, Marinette, Nino, Alya, Chloé, and Lila don't wear the Heroes' Day pin like the rest of the class, Miss Bustier, and Mr. Damocles.
- This episode premiered exactly one year after Season 2 had started (apart from "Santa Claws").
- The first person to get de-akumatied is Sabrina Raincomprix
- This is the sixth time two people have been akumatized in one day, the previous times having been in "Lady Wifi", "Princess Fragrance", "Antibug", "Volpina" and "The Queen's Battle".
- This is the first time more than two people have been akumatized in one day, with a total of four.
- Marinette doesn't have her earrings during the scene where she is 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 de-akumatized 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 appears to be Clara Contard, Thomas Astruc stated it to be an animation error.
- When Rena Rouge transforms, her eyelids are normal. However, after the transformation, her eyelids turn black.
- Just like in "Malediktator", Chloé's sunglasses are on her head prior to transforming, but disappear when she transforms.
- When Gabriel enters his lair, there are no butterflies shown, but after he transforms into Hawk Moth, the butterflies are there.
- When Gabriel and Nathalie are in the former's lair, the window is open. However after Gabriel turns into Hawk Moth, the window is shown to be closed, which leads to him opening it once again.
- While Trixx is talking to Nino, the Fox Miraculous on Alya's neck is in its charged form when it should be in its disguised form.
- Alix isn't wearing her cap when she is outside of the classroom running from the akumas nor when she is turned back into Timebreaker.
- When Adrien is telling the people to run away from the scarlet akumas, he didn't have his school bag.
- He also didn't have his bag when he ran to the door and when his bodyguard, as Gorizilla, captured him.
- Marinette didn't have her school bag when she ran into the bathroom.
- When the five heroes are together at the end of the episode looking at the Eiffel Tower, the Bee Miraculous in Queen Bee's hair is seen in its akumatized form.
- The earrings of the akumatized Ladybug don't have reverted colors.
- When Miss Bustier's class greets Lila during the video call, Kim's hair color is from black to brown.
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