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 Rogue 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 had 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 mirages. 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 makes it start to overflow.

Marinette returns the miraculous to Master Fu, and they go into another room. Tikki and Wayzz are prohibited from going in because kwamis can't know the recipes to modify their powers, and what would happen if they were captured by a villain like Hawkmoth's kwami, Nooroo. While Marinette and Fu are in the room, he is explaining to Marinette about different powers and blends. To get aquatic powers they need a magic ingredient; a tear of joy. Master Fu uses honeydew instead. While preparing Master Fu asked Marinette what's troubling her and she talks about Cat Noir's curiousity.

As the city starts to flood, Adrien is sulking playing with the ladybug and cat noir action figures talking about if they trust each other.

Adrien decides to bribe Plagg to tell what Ladybug is hiding with cheese. Plagg refuses to give in.

At Master Fu's massage shop, Fu tests the blend on Wayzz. He tries to transform but it doesn't work. Wayzz suggests it needs salt. Marinette leaves to go to the cinema.

Marinette arrives at the cinema and shuffles into her seat. As she sees people running away in fear she realises that the cinema is flooding with water. She and her friends run to the top of the building. The building was flooded, and Kim tries to teach them how to swim, saying that it makes them think like frogs. Syren then jumps from underwater and takes Kim. Marinette tries to find a place to transform.

After she transforms into Ladybug, she goes underwater to find Syren. She finds it hard to breathe, and cat noir saves her. She then uses the Lucky Charm and turns out to be a pot. She leaves cat noir to go to master fu, leaving cat yet again suspicious.

Marinette finds master fu on his tablet showing the ladybug with aquatic powers, saying that he failed Marinette and had tried everything. Marinette suggests to use a real tear of joy by using jokes. After telling 3 jokes Master fu starts to laugh and tear up in joy. Marinette uses this and puts it into the pot, meaning that the mix was complete. She feeds it to Tikki which makes her transform into "Aqua Tikki". Marinette transforms into Ladybug but with aquatic powers. As she leaves, she tells Master Fu that it was time that he "put the noodles into the boiling water".

While waiting, Cat Noir decides he should detransform into Adrien again, and threatens Plagg that if he didn't tell him what Ladybug was hiding, he would quit for good. He then sees Master Fu next to him right under his nose. Fu said he would explain later and gives him the blend.

Adrien transforms again and meets Ladybug at the pool where Kim and Syren were at. Syren shows Kim her bracelet, making Kim realise that she was Ondine. Syren says that it would just take a kiss for Kim to be like her, Ladybug interrupts which angers Syren. Ladybug uses the lucky charm which appears to be car keys. She chases Syren out of the pool and traps her in a car. She uses Cat Noir's extended staff and her yoyo to fish her out of the waters, destroys the bracelet and uses the Miraculous Ladybug to repair everything and Syren is reformed.

Back at the swimming pool, Kim and Ondine play secrets again, and Kim's note was to ask Ondine 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 is suspicious by this and goes to his lair. He interrogates Nooroo about where he could get new powers, and Nooroo says that only Guardians know. Gabriel says that he will find the guardian.

Back at the massage shop, Fu gives Marinette each blend for new powers in test tubes, but Marinette thinks that this is not very practical, so she makes magic macaroons made of each blend; "Magicaroons". There is also foreshadowing in this scene when Tikki says that the blue macaroon looks very tasty, and Marinette replies that the blue one is icy; the new powers used for Frozer.

Master Fu gives Adrien Camembert made of each blend. Plagg then says that he hates transforming before the ending card.

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

Trivia

 * This episode was first revealed in a TV guide from the UK.
 * The episode title, Syren, could be a pun on 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 marks the debut of the underwater power-ups.
 * According to the number of potions made, there are seven kinds of power-ups.
 * This is the second time Cat Noir didn't use his Cataclysm.
 * The First one was in the Darkblade.
 * When Tikki said, She is wondering blue most. Marinette said it's might be icy. This might be foreshadowing for the future episodes like Frozer.
 * Flashback of Origins part 1 can be seen.
 * This episode also show us that Rena Rouge does return during difficult missions, however she doesn't have the fox miraculous permanently.
 * This is the second time that Markov appears.

Errors

 * Just before Rena Rouge transforms back, her skin tone is lighter than it supposed to be.
 * Marinette's purse is missing its details.
 * Alya's bangs are miscolored in several scenes throughout the episode.
 * When Ladybug has her aquatic outfit, a few of the spots on her suit are missing in some shots.
 * When Ladybug opens her yoyo to capture the akuma, she is wearing her normal outfit for that shot instead of her aquatic outfit.
 * Similarly, When Ladybug and Cat Noir fist bump, for that shot Cat Noir is in his regular outfit instead of his aquatic outfit.
 * Gabriel's hair is miscoloured 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 is finished making the mini macaroons, her earrings are miscoloured white.
 * When Gabriel was talking to Nooroo Hawk Moth's lair there are no white butterflies in the room

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