The Winx girls travel to the island from a vision of Roxy's, the mystical world of Tir Nan Og sealed within the White Circle. Upon arriving, a mysterious figure keeps calling out to Roxy and a dark force soon abducts the Winx, taking them to the prison of all Earth's fairies. After freeing the Earth fairies, they reveal that they want revenge against the humans who imprisoned them, and declare war against all of humanity in turn.

Diana, the Earth Fairy of Nature, begins the war against humanity by transforming Gardenia into a huge jungle. The Winx girls must deal with this new menace, plus the kidnapping of their boyfriends, except for Nabu, who held strong against Diana. In the process, they learn from Miss Faragonda that there's another level of transformation for a fairy, an evolution of Believix, called Sophix.

The Winx girls' new popularity infuriates the Wizards of the Black Circle, so in a plot to make people hate fairies, they offer to transform Mitzi and her two friends into fairies. Meanwhile, Jason invites Musa to his wedding, and the Winx girls teach Roxy the basics of being a fairy.

The Winx gain their Sophix powers as they enter the Amazon Rainforest, where Diana has made her new lair, but after they split up, Flora, Musa and Layla are captured while saving the Specialists. Meanwhile, Bloom, Stella, and Tecna locate the source of Diana's power: the Sacred Bud.

The Winx Club and the Specialists manage to escape Diana's fortress as they realize that the Sacred Bud is connected to her; the more of the forest that is destroyed, the more Diana is weakened. The girls must save the forest as well as Diana, and also somehow manage to convince her to release Gardenia from its plant prison.

Aurora, Fairy of the North, comes to Earth, freezing it over and threatening to send the planet into another Ice Age. The Winx, using another evolution form called Lovix, which is winter-themed, confront Aurora.

The Winx girls return to Tir Nan Og with the Wizards of the Black Circle, but they end up in the fight of their lives when the magical kingdom is in danger. Nabu makes the ultimate sacrifice to save the kingdom and dies in the process, causing Layla to seek revenge for his death. In the end, she leaves the Winx Club and joins Nebula's army.

The Winx battle it out agents in Trix. Sirenix VS Sirenix.

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After learning about the Legendarium, the Winx travel to the Lost Library of Alexandria so the indestructible book can be locked away for good.

Selina awakens the Sphinx and unleashes it upon the whole city of Alexandria, causing the Winx to halt their search for the Fairy Godmother's diary.

The Winx's search for Fairy Godmother Eldora leads them to China. After an attack by the Trix, they meet Lu Wei, the last dragon tamer.

While alone on Earth back home in the town of Gardenia, Bloom realizes that Eldora could be nearby. Meanwhile, vampires have infiltrated the area.

The Winx head to Tir Nan Og, where Eldora says they can find an item that once belonged to the Legendarium World.

Flora finds the totem in the Legendarium World and brings it back to Fearwood to break the curse gripping the town's residents.

Thanks to the defeat of Acheron, Selina manages to get her powers back. It will be up to her to lock the Legendarium once and for all.

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Roxy is put to the ultimate test when the Wizards of the Black Circle threatens to destroy all of Gardenia and its citizens if she does not surrender.

The Winx form an unlikely alliance with the Fairy Hunters to help one of them after Duman comes down with an illness. They travel to the Sibillini Mountains in Italy, where they ask the Fairy of Justice, Sibylla, for help.

In order to fix this new threat, the Winx must gain a new power, called 'Harmonix'. It not only gives them new outfit, but now they can fight in the air, land, and under water a lot easier.

Both Bloom, and the rest of the Winx Club have gained the ability to cross the Gates, but the Witches have stolen Daphne's powers, and can now do do it too.

Daphne tries to warn Bloom of Tritannus' plans; Mike and Vanessa's attempt to clean up Garbage Island is interrupted by a monster attack.

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