The Trix witches are in the Infinite Ocean, unsuccessfully trying to harness the power of the Emperor’s Throne. They end up accidentally summoning the cursed nymph Politea and engage in a battle with her. Politea informs them that the throne will only empower the true emperor, Tritannus. The witches make a deal with Politea to return Tritannus from his prison in the Realm of Oblivion, which is only possible with the vital force of a young prince. Once they free Tritannus, the Trix plan to convince him to retrieve the mystical Pearl of the Deep, which will free Politea from her curse so she can help the Trix.Winx Club: The Mystery of the Abyss 2014.
The Trix travel to Gardenia to attack Bloom and her fiancé, Prince Sky. The two manage to hide, but the Trix capture Bloom’s pet rabbit, Kiko. The Trix render Sky unconscious after he tries to rescue Kiko. The Trix bring Sky to the Infinite Ocean and tie him to the Emperor’s Throne. The Trix and Politea cast a spell and Tritannus appears in front of them. Politea leaves, warning the Trix not to tell Tritannus anything about her. After Tritannus gains his consciousness, Trix leader Icy helps him regain his memory. He tells them that a powerful nymph, Omnia, has hidden the Pearl of the Deep. Tritannus and the Trix head towards Omnia’s cave.
At Alfea College, Bloom’s friends agree to help her journey to the Infinite Ocean to save Sky. They discover that Tritannus has sealed every gateway to the ocean except for the Oblivion Portal. The Winx enter the portal and are led through a dangerous dimension. Bloom wakes up in an empty void, where a dark illusion of herself appears to tell her that she has abandoned Sky. When Bloom eventually realizes that she is inside the Realm of Oblivion, she wakes the other Winx. They break free from the dimension with a convergence spell.