Daphne tells Bloom about a nymph Politea, who is under a dark spell. Politea’s Sirenix power could be what Tritannus needs to become Emperor of the Infinite Ocean, but Darcy and Stormy are determined to keep this from happening.
In the underwater Kingdom of Andros, Aisha's Uncle Neptune plans to crown his son Nereus as a Prince.
Daphne tells Bloom about a nymph Politea, who is under a dark spell. Politea's Sirenix power could be what Tritannus needs to become Emperor of the Infinite Ocean, but Darcy and Stormy are determined to keep this from happening.
The Sovereign Council must agree on how to protect the Magic Dimension. King Cryon of Zenith plans to look out only for his planet using an army of robot droids. But are the droids truly the best answer?
The Winx and Specialists plan a proper face to face date for Tecna and Timmy. How will the texting couple handle a romantic dinner for two? And will the Winx be able to fare without the help of Tecna?
Musa relies on a childhood lullaby to restore harmony in the sea. The Winx must now hone their understanding of the natural world and it's creatures to defeat Tritannus.
Tritannus takes the Seal from the Pillar of Balance. The planets are shaken, and Melody's Singing Whales disappear. In order to restore the Pillar and return the whales, the Winx must fight Icy and Tritannus.
Tritannus sends a hungry beast after the Selkies so that he can get to the Pillars. It's up to the Winx to apply their training and use their skills to save the Selkies and stop Tritannus.
As Daphne is held captive by Tritannus, she tries to warn Bloom of his dangerous plans. In Gardenia, Mike and Vanessa's attempt to clean up Garbage Island is disrupted when Tritannus sends a monster to attack.
Time is running out before darkness envelopes the magic dimension. All eyes are on Stella, the Fairy of the Shining Sun, to help restore light and save her ailing father.
To activate the Emperor's Throne, Tritannus must obtain the seals of the throne's missing pillars. When he takes the seal from the Pillar of Light, the planets are shaken, and it is up to the Winx to restore order.
The Winx start a movement to clean the trash from Gardenia's beach. With their new Sirenix powers, Tritannus and the Trix head to the Emperor's Throne, but quickly discover that not everything is as expected.