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|“||"But what I want more than anything else in the world is written on this piece of paper and...only you can give it to me..."||”|
—Marinette Dupain-Cheng, "Backwarder"
In a flashback taking place during World War II, a young Master Fu and Marianne Lenoir are running from Nazi soldiers looking for the Miracle Box. Marianne believes that they should fight and suggests that she use the Ladybug Miraculous while Fu uses the Cat Miraculous. However, Fu points out that if they lose, the Nazis will get a hold of the Miracle Box and insists that they go to England instead, though she wants to stay and resist even without the Miraculouses. Fu allows this but gives her a pin to remember him by. He also attempts to tell her something else, but Marianne says to wait until he gets back. When spotted by Nazi soldiers, the duo part ways.
In present day, Marinette has assembled Alya, Alix, Rose, Juleka, and Mylène at her house for an emergency meeting. All the girls, with the exception of Rose, are extremely tired as it is early in the morning. Marinette informs them that Adrien and his father have been invited to a royal wedding in England. Alya doesn't understand why that is such an emergency, so Marinette explains that Kagami and her mother were also invited and fears that Adrien may end up falling for Kagami while there. She asks the girls for some idea to prevent this from happening. Mylène suggests that they organize a demonstration and make the trains go on strike, but Alya points out that they'd probably just take a helicopter or private jet. Rose suggests that Marinette dress up as a famous British star and sneak into Buckingham palace to lure Adrien away from Kagami. However, Alix points out that when Adrien finds out who she really is, he'll get angry because he doesn't like lying and quite possibily fall for Kagami while Marinette gets locked in jail. Juleka suggests that Marinette kidnap Kagami, but all the other girls agree that's a bad idea. Alya decides that the best solution would be for Marinette to simply confess her feelings to Adrien before he leaves. Marinette nervously asks to try Juleka's idea instead, but the girls shake their heads in disapproval. Marinette says that she can't just confess her feelings to Adrien as she can't even talk to him without stuttering. However, upon noticing Wayzz by her bedroom window, Marinette quickly agrees with the idea and pushes the girls out. Once they're gone, Wayzz enters her room and alerts Marinette that Master Fu needs her before taking off. Marinette wonders if it's serious. Tikki says that Master Fu wouldn't send Wayzz if it was nothing, though Marinette reminds Tikki of the time he lost his keys and locked himself out of the house. Tikki says that Master Fu needs to learn to write and send texts, which gives Marinette an idea.
On the subway ride to Master Fu's place, Marinette writes a love letter to Adrien. However, she unintentionally says her thoughts out loud, causing her to get teased and laughed at by several of the passengers onboard. An embarrassed Marinette exits the train, with the passengers continuing laugh at her, and heads inside Master Fu's place. She finds out that he is ill, and a doctor is watching over him. Marinette asks her if he'll be alright, and the doctor responds that he will be and he's just being overdramatic. She gives Marinette a prescription for some pills Master Fu must take and tells "Mr. Chan" that he needs more fiber before exiting. Marinette is confused by the doctor calling him Mr. Chan, to which Master Fu explains that one can never be too careful. He also tells her that if anything happens to him, he wants her to watch over the Miracle Box, much to Marinette's surprise. He then gives her a note and tells her to give it to a woman by the riverbank wearing a Chinese ideogram brooch. Marinette asks who the woman is, and Master Fu explains that she is someone he's always loved but never got the chance to tell. Marinette finds it sweet that Master Fu has a lover but asks him why the letter must be delivered today. Master Fu says that it's because he has realized that he has waited far too long. This inspires Marinette to go through with delivering her love letter to Adrien as well. Wayzz begs Marinette to hurry with the prescription, as despite what the doctor said, he has a bad feeling about whatever Master Fu has. Marinette agrees and takes off. However, she soon realizes that Adrien's train will be leaving in about 20 minutes. Tikki says that between delivering her love letter, Master Fu's love letter, and the prescription, she won't have time to do everything. Marinette says that maybe she can't, but they can. She transforms into Ladybug.
Ladybug heads to the train station and detransforms just as Gabriel, Mrs. Tsurugi, Kagami, and Adrien begin to board the train. However, before Adrien goes inside, Marinette approaches him and hands him a note. She tells him to read it on the train and that what's written in it is something she's always wanted, but only he can give it to her. She then takes off, transforms into Ladybug once again, and heads to her next destination.
On the train, Mrs. Tsurugi tells Gabriel that she senses some uneasiness in him. Gabriel claims that he doesn't like being away from home. Mrs. Tsurugi tells him that those who hope give themselves the opportunity to obtain what they desire, but those who fear end up with the very thing they dread the most. Gabriel tells Mrs. Tsurugi that he'll remember that. Meanwhile, Adrien reads the note Marinette gave him and is surprised by it.
By the riverbank, Marianne sits besides Xavier Ramier and tells him how she is confident that today is the day "he" is coming. Xavier calls "him" a lucky man just as Ladybug shows up and gives Marianne a note. She then heads to the pharmacy and gives the pharmacist a note. After reading it, she tells Ladybug that while she appreciates the heart-felt declaration, she's already taken and her name isn't Marianne. Horrified by the mix-up, Ladybug wonders who has the prescription. Meanwhile, Marianne reads the letter Ladybug gave her. Upon coming across the part that says that it might be "too late" and "all your hopes and dreams are ruined", Marianne fears that this means that Master Fu no longer loves her. Though Xavier attempts to comfort her, Marianne walks off sadly.
Gabriel senses Marianne's negative emotions and heads to the train bathrooms. As the conductor announces that the train is about to depart, Gabriel tells him that no one is leaving as he is not feeling well. At first the conductor gets angry with him, but when Gabriel yells at him, the conductor relents and agrees to halt the train departure. As he announces the delay in departure to the other passengers, Gabriel goes into one of the bathrooms, transforms into Hawk Moth, and sends an akuma after Marianne. It infects her brooch as she is walking up some stairs. Hawk Moth offers her the power to make up for lost time by stealing it from others in exchange for Ladybug's and Cat Noir's Miraculouses. Marianne agrees and is transformed into Backwarder. The first thing she does is tap Xavier with her wand, making him perform his previous actions in reverse and repairing a crack on her face. She then does the same thing to a boat and a car. Adrien hears about Backwarder on a news broadcast on his phone. He tells Kagami that he is going to check on his father and takes off to the bathrooms. The first one he attempts to enter is occupied by Hawk Moth, so he enters another one and transforms into Cat Noir.
Ladybug follows Backwarder as she uses her powers on a Ferris wheel. She figures out that Backwarder is Marianne and the akuma is in her brooch. Backwarder continues to tap more and more cars and people with her wand, making them go back in time. A car going backwards and a woman with a baby stroller nearly collide, but Ladybug saves the woman just in time. Cat Noir then joins her, and Ladybug tells him where Backwarder's akuma is before they head towards her. Before Backwarder can use her powers on another person, Ladybug stops her with her yo-yo. Backwarder tells her that all she has to do is touch her and wait until she transforms back. Hawk Moth says that then she can give him her Miraculous, but Backwarder says she wants Ladybug to lead her to the man who gave her her Miraculous. Surprised that she knows the guardian of the Miraculouses, Hawk Moth orders her to take him to the Guardian. Backwarder informs him that Master Fu has been living in Paris under a fake name but now thanks to him, she'll be able to reunite with him. While Hawk Moth is delighted at receiving this information, Ladybug tells Cat Noir that they must not let Backwarder touch her, as she was at Master Fu's place earlier and could end up leading her and Hawk Moth to him. Cat Noir agrees, and the duo battle her. However, they struggle to overpower her. They escape from her in order to come up with a plan. Backwarder follows them and declares that once she's defeated them, they'll lead her to Master Fu. Hawk Moth adds that he'll be able to get a hold of not only Ladybug and Cat Noir's Miraculouses, but all the other Miraculouses, too.
While Backwarder searches for Ladybug and Cat Noir, Ladybug calls on her Lucky Charm and receives a pipe. She comes up with a plan where she puts the pipe down on a place she marks with an X, ties a kite string to the pipe and Cat Noir’s ankle, and has him move back until the string is tight. She then tells him to say Cataclysm backwards, and once he does, she turns on her yo-yo’s timer and tells Cat Noir to move the pipe back to him. Once he does so, Ladybug tells him to follow her.
Backwarder demands that Ladybug and Cat Noir come out, stating that they are only delaying the inevitable. Ladybug and Cat Noir confront her, with the former saying that they're all hers now. Backwarder declares that she and Master Fu will soon be together again and charges at the duo. As part of her plan, Ladybug pushes Cat Noir in front of Backwarder, allowing her to touch him and making him perform his previous actions backwards. Backwarder calls Ladybug a coward for sacrificing her partner and chases after her. Hawk Moth asks why she doesn't simply take Cat Noir's Miraculous, and Backwarder says that he'll understand soon enough, as Cat Noir is now powerless and Ladybug is her ticket to Master Fu. Once Ladybug reaches the place she marked with an X, she feigns a sprained ankle. Backwarder lunges towards her, but Ladybug jumps out of the way and Backwarder ends up tripping over the pipe Ladybug had tied around Cat Noir's ankle. As she trips towards him, Cat Noir calls on Cataclysm and uses it on Backwarder's brooch, freeing the akuma. Ladybug purifies it and returns everything back to normal. Cat Noir is still confused as to what Backwarder's rampage was all about, but all Ladybug tells him is that girls are mysterious that way. Seeing that he's about to transform back, Cat Noir bids farewell to Ladybug and takes off. Ladybug then apologizes to Marianne, explaining that she had given her the wrong note earlier and, while handing her the correct one, says that although she can't change the past, the note may change her future. Once she leaves, Marianne reads it and smiles. Meanwhile, Hawk Moth declares that Ladybug hasn't won, as now he has more information that will allow him to track down the guardian of the Miraculouses. Gabriel then comes out of the bathroom and runs into Adrien, who comments on how much better his father seems to be feeling. As the two of them go back to their seats, the train begins to depart for London.
Master Fu apologizes to Marianne about taking so long to come to her, afraid that as long as he was the guardian of the Miraculouses, he’d be a danger to anyone he was close to. Marianne understands, knowing the responsibility Master Fu has as a guardian. However, the two realize that Hawk Moth now knows that she knows him and until he’s defeated, they can’t be together, while Xavier smiles, moved at this romantic scene. Marinette and Tikki watch this from afar. Tikki wonders why Master Fu doesn’t simply tell Marianne how he feels, to which Marinette says that it’s probably not the right time. Tikki then asks Marinette when the right time for her will be, to which Marinette says she’ll see how she is after seeing Adrien at school.
At school the next day, the girls ask Marinette how everything went with Adrien. Marinette nervously tells the girls that she gave Adrien a letter, to which they all cheer. Rose asks Marinette what she wrote in the letter, but Marinette, too embarrassed to admit about the mix-up, insists that it’s not important, though Alya disagrees. Adrien then approaches Marinette and tells her that though he was surprised by her letter, he spent the whole weekend in London looking for it since it seemed so important. He gives her a bag, which an embarrassed Marinette takes and thanks him. Adrien says he’s glad to help and heads inside the building. Once he’s gone, Marinette calls the situation a disaster, which the other girls don’t understand since Adrien spend an entire weekend thinking about her and even brought her back a gift. The girls want to know what’s in it. Though Marinette attempts to hide it from them, they grab it and see that constipation capsules are inside, making Marinette even more embarrassed where she drops to her knees. While the other girls are confused, Rose calls it a beautiful display of pure love before they laugh at this.
- Marinette Dupain-Cheng/Ladybug
- Adrien Agreste/Cat Noir
- Gabriel Agreste/Hawk Moth
- Marianne Lenoir/Backwarder
- Wang Fu
- Alya Césaire
- Alix Kubdel
- Mylène Haprèle
- Rose Lavillant
- Juleka Couffaine
- Jean Duparc
- Master Fu's doctor
- Tomoe Tsurugi
- Kagami Tsurugi
- Xavier Ramier
- Startrain conductor
- Nadja Chamack
- August's mother (background)
- August (background)
- Nazis (voices)
- British megastar: Adeline (mentioned)
- The flashback of young Master Fu and Marianne Lenoir in the opening is set during World War II.
- It turns out that Marianne, the “old friend” of Master Fu, is actually his lover whom he had separated from decades ago.
- It's revealed that Master Fu wants Marinette to become the next guardian of the Miracle Box in case something happens to him.
- This is the second time Cat Noir does the Moonwalk, following "Mr. Pigeon".
- In this episode, Hawk Moth learns that the guardian is named Master Fu and goes by an alias.
- This is the first time Hawk Moth transforms and creates an akuma somewhere other than his lair onscreen, so for the first time, his lair is not seen.
- It's revealed that Hawk Moth's cane can create or summon the butterflies he uses to create akumas.
- However, the cane might only store it, as in the episode "Stoneheart".
- This is the first time Ladybug stores or captures something else inside her yo-yo in the main series.
- It also reveals that the things in her purse remain inside the yo-yo while she is transformed.
- It is further revealed that Ladybug's yo-yo has its own timer.
- The sign 爱 on the brooch means "love" in Simplified Chinese. This sign was not used before 1956; the traditional one is 愛. This is an apparent anachronism.
- Thomas Astruc confirmed that the pipe is the most complicated Lucky Charm.
- Marinette mentions Adrien and Kagami going to a royal wedding in England referencing the upcoming royal wedding between Lady Gabriella and Thomas Kingston in May 2019.
- Gabriel delaying the train, foreshadows the capabilities and limitations of his powers as Hawk Moth which is discovered in "Startrain".
- Mentioned in "Troublemaker", it confirms when people are akumatized they like Miraculous holders have a resistance to Miraculous superpowers that they are lethargic to as Cat Noir's Cataclysm, as he used it on the brooch and it was destroyed but the titular villain was just fine.
- Seconds before Marinette places Fu's letter in her purse, Tikki can't be seen floating next to her
- Cat Noir's Cataclysm disappears after he summons it.
- In the scene where Backwarder uses her powers on a fallen leaf, there are still cracks present on her mask. However, in the scene directly after, the cracks have all disappeared.
- When Ladybug prompted Cat Noir to say "Cataclysm" backwards, it took her about five seconds to figure out how to say it. During that time, Cat Noir had his right hand in the air. Played backwards, there should have been a five-second pause between him saying "Cataclysm" and lowering his hand. Backwarder staggered forward after she tripped, but it only took about a second. There would be several seconds left before the hand was lowered, giving Backwarder ample time to recover her balance and escape the trap.
- According to Alya, the episode takes place on a Saturday. However, school is in session the next day.
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