To get to the Pillars, Tritannus takes control of a monstrous fish called the Devourer; meanwhile, all the planets' kings meet to plan his defeat.
In the Infinite Ocean at the Emperor's Throne, Icy and Tritannus are admiring the seal they stole from the Pillar of Light. Tritannus decides immediately to go after the Pillar of Balance and for once, Darcy and Stormy are happy to follow him so they can wreck havoc around. They spot a giant fish which tries to eat Icy, who dodges in time.
The Trix attack the fish together, but it is not stopped, but instead it grows more angrier and swims after Icy, who shouts Tritannus for help. The fish bites Icy's hair, trapping her for a second. When it tries to eat her, Tritannus arrives and shoots the fish with pollution. As the Trix questions him about the fish, Tritannus explains that its a Devourer which eats everything in its way. Tritannus decides to use the Devourer against the Winx and sends it to attack the selkies at the Pillar of Light. Daphne overhears the plan and decides to contact Bloom again.
Flora and Bloom are discussing an upcoming meeting of all the royal families of the Magic Dimension and Bloom regrets that she has to miss the training session with Codatorta from Red Fountain to go to the meeting. Flora and Aisha then remind her that the Council of Sovereigns is a political and diplomatic war meeting, and therefore just as important. Stella is worried about what they should wear, so she gives special outfits to Bloom and Aisha but the style is too fierce for Kiko (and weird for the girls), so Stella changes it to a more classic princess styled dress with flowers instead.
Soon in Domino's royal palace, royal families are starting their meeting and Bloom, Stella, and Aisha have arrived as well. Bloom waves to Sky, who waves back and looks a bit uncomfortable from standing next to Diaspro, who tells him to focus, which makes Bloom feel bad. Oritel and Marion stand up and welcome Nereus and Tressa to the palace as they come up from the pool in the middle of the room. Some of the royals start clapping. Nereus then tells them to thank Bloom, Aisha, and Stella who freed him and his sister from Tritannus. As Oritel and Marion explain the situation about Tritannus, they think each realm should unite against him. The royals immediately began arguing. Erendor, Radius, and Cryos claim that they do not need anyone's help.
Back at the Infinite Ocean, Sonna, Desiyree, and Lithia are playing with some bollabies, but some fishes scatter as Tritannus' Devourer arrives. The Selkies recognizes the giant beast and Sonna tells everyone to escape. Lithia soon realizes that the Devourer is after the three of them and fires at the Devourer only to stop it for a second. They then try to drive the beast against the rock, but the rock only gets smashed by it. The Selkies hide in a cave and try to find another way out as the Devourer is blocking the entrance. Unfortunately, the cave becomes a trap and the selkies are stuck inside. The Devourer then starts to headbutt the cave, to make it bigger for him to enter.
At Alfea, Flora, Tecna, and Musa meet up with Helia, Timmy, and Riven who they were not expecting to see there. Codatorta arrives with a dragon which three specialists have to guard from getting away. Helia points out that a dragon is a wild savage dragon. Codatorta lands down and explains that they have to use their Sirenix powers to tame it. He lets the dragon go and it immediately tries to escape but the specialists keep it from flying away from Alfea. The Winx are unsure but determined so they transform into their Sirenix forms. As they attack unsuccessfully, Tecna protects Flora and Musa, Musa states that its going to take a while.
At Domino, the royals are trying to agree with each other. Bloom and Sky leave the room to talk in private. Stella tries to convince her father to agree with Oritel's and Marion's plan but Radius states that she is too young to understand. Stella states that youth does not concern her as she is a princess and the Guardian Fairy of Solaria. Radius then admits once again of being proud of Stella, who tells her father to think what she said. Bloom and Sky talk about their relationship and how Diaspro is coming between them by using her new high rank.
Sky states that he belongs to Bloom and they almost kiss, but Diaspro interrupts them by saying that Sky's father wants him to be present in the room. As Diaspro tries to offend Bloom by telling her to give up on Sky before he does it to her, Bloom tells her to call her "Princess Bloom" and that she should stop trying to come between her and Sky because its never going to work. Diaspro disagrees adding "Princess Bloom" to the end of her sentence and leaves. Daphne then contacts Bloom telepathically to tell her that Tritannus attacked the Selkies with a Devourer. Bloom starts to search for Stella and Aisha but realizes that the meeting is not over, which prevents them from leaving, so she tries to warn the others as well.
Musa, Flora and Tecna are still trying to figure out how to take control of the dragon (Tecna mentioning that they tried to sing to it, reason with it and feed it with flowers, even though it only eats meat). Riven advises the Winx to stop being nice to it, much to annoy Musa. Flora realizes that the mustache in its cheeks is its weak spot.
Working together, they are able to take control of the dragon without hurting it. As they ride a little and land back to the ground, Codatorta asks what they have learned. Tecna's answer is that every creature has a weak spot. Flora's answer is that finding a weak spot is a way to control a creature. Musa answers that dragons do not eat flowers, which makes everyone laugh. As soon as they finish, Flora gets a call from Bloom that the selkies are in trouble. While the Winx take a dive into the Infinite Ocean, the Devourer is still trying to break into the cave. Lithia gets an idea to make a hole to the roof when the Devourer gets through. The Selkies blast the roof and swim away, but the Devourer is still on their tail. The Winx arrive just as the monster is about to eat Desiyree and catches her in its mouth. The Winx realize their attacks are not working, and use the lessons they had learned from Codatorta, to find the fish's weak spot and defeat it, freeing the Devourer from Tritannus' control and Desiyree from its mouth.
Back on Domino, the royals are at an impasse. Radius agrees to join the alliance if the other kingdoms' will. But no one else agrees and he withdraws his support saying that how can he join an alliance that does not exist. Aisha is shocked to see how the union is falling apart. Bloom asks Sky to reason with his father which Sky states is impossible. Diaspro tells Bloom that Sky must follow his father, which makes Bloom angry. She tells Diaspro that her opinion was not important. Diaspro then tells Sky that Erendor is asking for him and Sky nods to Bloom as an agreement to reason with Erendor, leaving Bloom alone in hopes of success.
- Tritannus decides to go after the Pillar of Balance.
- Tritannus takes control of the Devourer and sends it to attack the Selkies.
- Kingdoms of the Magical Dimension meets up in Domino's royal palace, but none of them agrees to unite with each other except Domino and Andros. It is unknown if Linphea and Melody will also protect themselves.
- Stella reasons with Radius who then chooses to join forces with the others if other realms do the same, but none of them forms an alliance, making Radius to give up.
- Bloom asks Sky to reason with Erendor, so Eraklyon would join forces with Domino and Andros.
- The rulers of Zenith, Melody, Linphea, except for Galatea and Krystal, are seen for the first time.
- Blizzard - Used by Icy in a convergence with Lightning Bolt and Dark Spell against the Devourer.
- Neon Splice - Used by Tecna to defend Flora.
- Selkies Convergence - Used by the Selkies to escape from the devourer.
- Lotus Flower - Used by Flora against the devourer.
- Percussive Hit - Used by Musa against the devourer.
- Genesis Blow - Used by Tecna twice against the devourer.
- Feast of Flowers - Mentioned; used offscreen by Flora to feed the Wild Dragon.
- Deafening Chord - Used by Musa twice against the devourer.
- Petal Hurricane - Used by Flora twice against the devourer.
- Galatea, Krystal, and Roy make cameo appearances in this episode.
- This is the first time Bloom asked the Winx to fulfill a mission without her.
- It is unknown why Nebula nor Morgana and Roxy didn't attend the meeting held at Domino since they are royalties from Earth.
- The alternative titles for this episode were "The Selkies Devoured" and "The Selkies Devourer".
- Whilst discussing how the realms will deal with Tritannus, the right side of Flora's bangs, the highlight swapped positions.
- Tecna's voice and spell is said by Musa while Musa's voice and spell is told by Tecna.
- In one scene, Riven's cape pendant is yellow instead of pink.
- In some scenes, the strap on Musa's Sirenix outfit disappears.
- Before Tecna transforms back, her skirt is blue.
- In the same scene, Tecna is missing her arm ribbon and Musa's arm ribbon is on her left arm instead of her right.
- While Tecna's protecting Flora from the dragon, her arm ribbon is red.
- In one scene, Flora is missing her bracelet.
- When Diaspro turns around after Bloom berates her for her unneeded opinion, the lower portion of her hair is missing. At the same time, her necklace is the same color as her hair.
“Dragons... don't eat flowers?”
“It's just a fish.”