Syren

"" is an episode of Season 2 of Miraculous: Tales of Ladybug & Cat Noir. It first premiered worldwide in Spain on May 5, 2018.

Synopsis
''Talented swimmer Ondine gets akumatized into Syren. She has feelings for Kim and wants to turn Paris into an underwater kingdom for her prince.''

Plot
Nadja Chamack reports on several escaped zoo animals rampaging across Paris, while Ladybug, Cat Noir and Rena Rouge try to put them back in their cages. Meanwhile, Ondine and Kim are at the swimming pool. Kim wonders what it's like to be a superhero, while Ondine gets a note from her notebook and puts it in the capsule of the bracelet on her wrist. Ondine then turns to Kim and asks if he wants to know her secret, before throwing the bracelet in the water for Kim to get. Kim retrieves the bracelet and reads the note inside, which says that Ondine has a huge crush on a boy who has no idea about it. Oblivious, Kim says that the boy Ondine has a crush on is clueless. He then puts another note in her capsule and throws it in the water for Ondine to get. She reads the note saying that Kim can put his big toe in his ear. Ondine decides to open up more on who she's crushing on, and throws the capsule into the pool. As Kim is about to open the note, his watch alerts him that he's going to be late for the movies. Kim tells Ondine that he asked Chloé to come to the movie with him. After Kim leaves, Ondine is left on the poolside, lamenting on how Kim was the one she had a crush on.

Having sensed Ondine's sadness, Hawk Moth's lair opens up. Hawk Moth remarks on how many times Ondine has tried to tell "her prince" of how she feels, and how many times she has been dismissed, before creating an akuma and sending it to akumatize her.

As this happens, Cat Noir is being chased by a pair of panthers, asking if they would really eat one of their cousins. Rena then uses her Mirage power to create a series of steak illusions. The panthers fall for the mirages, and are driven into and trapped in the back of a van. Cat Noir prepares to fist bump Ladybug and Rena, but Ladybug and Rena have to leave, because the latter is about to transform back. Upset, Cat Noir asks why Ladybug is allowed to know who Rena really is when he isn't. Ladybug explains that she must return Rena's Miraculous. Cat Noir asks if his role is to be left in the dark about Ladybug's secrets, and Ladybug says she will talk to "him" about it. Cat Noir asks who "him" is, but Ladybug and Rena leave. Frustrated, Cat Noir declares that he hates secrets.

Rena soon detransforms back into Alya, and hands her Miraculous back to Ladybug. Alya offers to team up with Ladybug again, but her phone alerts her that she's late to the movies, and she runs off. Ladybug turns back into Marinette and begins running in the opposite direction to get to the movies. Tikki tells Marinette that, if she wants to get to the movies, she should run the other way, but Marinette opts to miss the trailers again. Overhead, the akuma flies into the swimming pool and attaches itself to Ondine's bracelet. Hawk Moth offers Ondine the power to turn Paris into an underwater kingdom for her and her prince in exchange for the Ladybug and Cat Miraculouses. Ondine accepts the deal and turns into Syren. Syren's tears fall into the pool, which make it start to overflow.

Kim runs up to the cinema, where Max and Markov are waiting for him. Kim asks if Chloé came, but Max jokingly asks if he really thought she would come see Mecha Monkey vs. Cyber Shark 3. Alya runs up to the two boys and asks if Marinette is late too, which Max confirms. Alya stands outside to wait for Marinette, while Max, Kim and Markov enter the theater, promising to save them a seat. Meanwhile, water floods out of the swimming pool.

Marinette returns the Fox Miraculous to Master Fu at his massage shop, and Fu asks what's troubling her. As they enter the next room, Fu prohibits Tikki and Wayzz from following, as Kwamis aren't allowed to know the recipes that can modify their powers, in case they are captured like Nooroo. In the next room, Marinette explains that Cat Noir is asking more questions and is tired of being left in the dark, but Fu insists that they must wait for the right time to tell him the truth. He then shows that he is unlocking the recipes to give her and Cat Noir new powers, however, he is unable to figure out what ingredient the "Tear of Joy" is. Thinking the Tear could be honeydew, Fu adds it to his brew, and believes he has unlocked underwater powers.

As this happens, people beside the Seine run away as it begins to overflow. At the Agreste mansion, Adrien is in his room, playing with Cat Noir and Ladybug action figures. Adrien expresses his frustration with Ladybug not trusting him through the figures. Adrien turns to Plagg, and asks if he knows what Ladybug is hiding from him, but Plagg refuses to tell. Adrien then begins offering to order Plagg different types of cheese if he tells the truth.

Back at the massage shop, Fu feeds Wayzz the recipe, and he believes it to be the right one. Excited, Fu prepares to transform and acquire new powers, but Wayzz is then unable to, suggesting the recipe could use a little more salt. Alya calls Marinette, who rushes off to the cinema, leaving Fu and Wayzz.

Marinette arrives at the cinema and enters with Alya, unaware of the water running through the streets behind them. Rose, Nino and Juleka wave Alya and Marinette down, and they shuffles into their seats. As the movie starts, Marinette notices people running away in fear, and realizes that the cinema is flooding with water. Outside the cinema, water rushes through the streets and floods them. Back in Adrien's room, he is still trying to bribe Plagg when he notices that the room is filling with water. He then turns into Cat Noir.

Marinette runs up to the top of the building to see that all of Paris has been flooded. Unconcerned, Kim jumps in the water and says he can teach Markov to swim. A fin swims towards Kim and Syren jumps from the water, and takes him. While her friends try to look for Kim, Marinette uses a recycling bin and shovel to paddle away, claiming she is going to get help. Cynically, Alix asks if this means they're saved.

Underwater, Syren grasps Kim and creates an air bubble for him to breath in. Marinette then transforms and searches for Kim underwater. Ladybug soon spots Syren and Kim, the former showing Kim around the submerged Paris, much to his amazement. Ladybug latches onto Kim with her yo-yo, but Syren tries to pull him back. Hawk Moth remarks on how every new environment brings a new set of rules, and that Ladybug can't win because she can't breath underwater. He then asks Syren if she is going to let Ladybug take away her prince. Cat Noir is scrolling across the rooftops above the water, when he sees Ladybug flying through the air, having been knocked out of the water by Syren. Cat Noir saves Ladybug, and asks if there's a chance she can get them a submarine. Ladybug then uses her Lucky Charm, and receives a pot. Knowing the pot indicates Master Fu, Ladybug says she has to leave. Cat Noir is frustrated at Ladybug not telling him the truth, despite them being a team, but Ladybug insists it isn't easy for her either. Ladybug then zips away, while Cat Noir is left behind, further frustrated.

Ladybug detransforms and finds Master Fu. Marinette tells Fu that she and Cat Noir can't beat Syren underwater, which he knows, although he can't find the right blend that could give them underwater powers, believing he has failed them. Marinette suggests to use a real tear of joy in the recipe, and tells Master Fu a series of jokes, making him shed a tear in laughter. Marinette takes the tear and drops it into the pot, which releases a burst of green energy. Excited, Fu says Marinette has found the final ingredient. Fu immediately feeds the potion to Tikki, who powers up into Aqua Tikki. Marinette transforms into Ladybug, and receives new aquatic powers. Before leaving, Ladybug turns to Fu and tells him its time to "put the noodles in the boiling water", which he agrees to.

Meanwhile, fed up with waiting, Cat Noir transforms back into Adrien and threatens to quit being Cat Noir if Plagg doesn't tell him the truth. Plagg says that he can't do that, but Adrien insists no one will know or care if he does. Plagg says he would, although Adrien believes this is because there will be no one to give him Camembert. Plagg states that he's sue there will be another Cat Noir to feed him cheese, but they won't be Adrien. Adrien cheers up because of this, and Master Fu, acknowledging him as Cat Noir, appears beside him. Adrien recalls how he had helped Master Fu on the first day of school, and Fu hands him a vial of the potion, telling him he must help Ladybug. Plagg then moans about how he hates transforming.

Inside the submerged swimming pool, Kim, inside a giant bubble, remarks that he loves what Syren has done to the place. She says that the pool is where she had tried to pour her heart out to Kim many times, and, after seeing her bracelet, he realizes Syren is actually Ondine. Syren says that she can turn Kim into a merman with a kiss so they can rule their underwater kingdom forever. Before this can happen, Kim asks if that means he'll never get to see Mecha Monkey vs. Cyber Shark 3, confusing Syren. Ladybug swims in and tells Kim he will get to see the movie, and Cat Noir joins in. Hawk Moth confirms his suspicions of the Miraculous possessing hidden powers, and tells Syren to take them before Ladybug and Cat Noir take Kim away from her. Ladybug and Cat Noir begin to fight Syren using their new abilities. Kim tells Ladybug about how cool her new outfit is, and she asks what got his friend so worked up. Kim explains that he and Ondine were playing a game of Secrets in which she tried to tell him that he was the boy she liked, but he didn't realize it at the time. Realizing the bracelet must be where the akuma is hidden, Ladybug uses her Aqua Lucky Charm and summons car keys.

Ladybug gives Kim her yo-yo to breath through, and he escapes while Syren and Cat Noir are fighting. Syren pursues and demands that Ladybug tell her where Kim is, unaware he is on the roof above them. Syren chases after Ladybug through several floating cars, only to be trapped inside on by her and Cat Noir. Ladybug locks Syren inside the car with the keys and Cat Noir fishes the car out of the water using her yo-yo string and his staff. Ladybug unlocks the car and breaks the bracelet, releasing the akuma, which she then purifies. She throws the keys in the air, returning the city and Syren to normal. Cat Noir thanks Ladybug for keeping her promise, and the two of them fist bump.

At the massage shop, Fu gives Marinette each blend for new power in different vials, which he tells her to keep with her at all times. Marinette thinks this is not very practical, and Fu says that only the ingredients matter, and that she can keep them in anything, giving her an idea. Marinette bakes some macaroons at her house, but when her father tries to eat one, she says she'll taste them first. In Marinette's room, Tikki says she loves the idea of magical macaroons, which Marinette places in a box. Meanwhile, at the pool, Kim hands Ondine her bracelet, asking if she wants to play a game of Secrets. Ondine opens the bracelet and reads the note, which asks her if she wants to go to the movies.

At Adrien's house, he is practicing Chinese for his class. Master Fu appears at the door claiming to be Mr. Chan, a substitute for Adrien's Chinese tutor. Gabriel appears to be suspicious but nevertheless lets him in. Nathalie brings Master Fu to Adrien and once she leaves, Plagg introduces him as the last guardian of the Miraculouses.

Gabriel goes into his lair and interrogates Nooroo about how he could get new powers. Nooroo says that only Guardians know. Gabriel proclaims that he will find the guardian. Meanwhile, Master Fu gives Adrien Camembert made of each blend. Plagg then groans saying that he hates transforming before the ending card appears.

Major characters

 * Marinette Dupain-Cheng/Ladybug
 * Adrien Agreste/Cat Noir
 * Gabriel Agreste/Hawk Moth
 * Tikki
 * Plagg
 * Akuma
 * Ondine/Syren
 * Lê Chiến Kim
 * Master Fu
 * Wayzz

Minor characters

 * Nadja Chamack
 * Alya Césaire/Rena Rouge
 * Chloé Bourgeois (mentioned)
 * Trixx (background)
 * Max Kanté
 * Markov
 * Ancient Chinese Ladybug Miraculous holder (pictured)
 * Rose Lavillant
 * Juleka Couffaine (background)
 * Nino Lahiffe (background)
 * Alix Kubdel
 * Nathalie Sancoeur
 * Adrien's bodyguard (flashback)
 * Tom Dupain
 * Emilie Agreste (pictured)
 * Nooroo
 * Animals
 * Civilians

Trivia

 * This episode was first revealed in a TV guide from the UK.
 * The episode title, Syren, is derived from the word "Siren."
 * This episode was originally supposed to air on April 21, 2018, in the UK, but it didn't due to a sudden change of schedule.
 * It was later rescheduled to air on May 12, 2018.
 * This episode also shows us that Rena Rouge does return during difficult missions, however, she still has to return the Fox Miraculous at the end of the mission.
 * This episode marks the debut of the underwater power-ups.
 * According to the number of potions made, there are seven kinds of power-ups.
 * When Master Fu first addresses Adrien as Cat Noir, flashback scenes from Origins Part 1 are shown.
 * This is the first episode that features a Lucky Charm without the ladybug pattern.
 * This is the third time Cat Noir didn't use his Cataclysm; the first occasion being "Darkblade" and the second in "The Mime."
 * When Tikki said she wonders what the blue macaroon tastes like, Marinette replies "I'm told it's icy". This might be foreshadowing for future episodes like "Frozer."
 * This episode shows the highest number of kwamis seen in a single episode, with five kwamis - Tikki, Plagg, Trixx, Nooroo and Wayzz - being shown.

Errors

 * Just before Rena Rouge transforms back, her skin tone is lighter than it supposed to be.
 * Marinette's purse is missing its details.
 * When Kim arrives to the movies, his swimming cap and goggles are on for a few frames before it turns to Max, when it faces Kim again the goggles aren't on his head.
 * The Bee Miraculous is drawn differently than how it supposed to be in "Sapotis."
 * When Ladybug has her aquatic outfit, a few of the spots on her suit are missing in some shots.
 * When Ladybug is pleased to see Cat Noir arrived in his aquatic form and landed right next to Ladybug, the scales on Ladybug's mask disappeared.
 * When Ladybug opens her yoyo to capture the akuma, she is wearing her normal outfit for that shot instead of her aquatic outfit.
 * Similarly, in the shot where Ladybug and Cat Noir fist bump, Cat Noir is in his regular outfit instead of his aquatic outfit.
 * Gabriel's hair is miscolored grey.
 * Rena Rouge has black around her eyes and a black accent at the bottom of her mask which doesn't match her appearance in "Sapotis."
 * When Marinette finishes making the mini macaroons, her earrings are miscolored white.
 * When Gabriel was talking to Nooroo in Hawk Moth's lair, the room is devoid of butterflies.
 * Syren's eyelashes are missing when she shows her watch bracelet to Kim and then it returns again.
 * Ondine's name is mispronounced as Undine in the episode.

Sirena Syren pt-br:Sirena Сирена