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.

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

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As Bloom tries to reassure Sky that she and Andy are just friends, Roxy, while holding the White Circle, is possessed by anger and rage and goes to take on the Wizards of the Black Circle.

Musa's singing attracts the attention of a record manager named Jason, who offers her a record deal. Riven's jealousy toward Jason causes him and Musa to drift farther apart. Meanwhile, the other Winx girls and Roxy suffer many failed attempts to get the people of Gardenia to believe in fairies. Only when the girls help extinguish a fire created by the Wizards do the people slowly regain their belief in magic.

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.

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.

Roxy discovers that the Wizards have abducted her father, and she is captured herself when she gets home to inform her father of her magical abilities. Artù, Kiko and the Love & Pet animals mount a rescue mission to save both of them, but Artù is injured by Gantlos in the process, which allows Roxy to awaken her dormant fairy form.

The Winx girls and Roxy must deal with their new popularity within Gardenia while also dealing with a pair of animal smugglers.

The Specialists and the Winx soak in the sun on Paradise Bay, but their vacation is cut short when they hear of a threat to all the island's animals.

Realizing the significance of the diamond Digmole statue in Faragonda's office, the Winx shrink down and enter it in search of the Ultimate Power.

Finally free and with the Ultimate Power in their hands, the Trix rush to overtake Alfea, but the Winx are there to stop them.

The Wizards invade Love & Pet and bewitch several of the animals. The Winx girls must round them up and find a way to reverse the spell. Meanwhile, Mitzi shows her affection for Brandon after he saves her from one of the bewitched animals. This begins to infuriate Stella.

Tecna reveals that she has created a virtual world in her computer to hide the White Circle, but while the girls go to perform at the Frutti Music Bar, the Wizards enter the virtual world to find it.

Back in the present, the Digmoles are no longer endangered. They reveal the secret to obtaining the Fairy Animals' Ultimate Power to the Winx.

Thinking that the ancient CryCry could be the animal they're looking for, the Winx travel back to prehistoric times.

To restore the balance of nature on Paradise Bay, the Winx need to grow a new Gem of Light by traveling into the Drop MiniWorld.

To restore light to the heart of Alfea, the Winx go back in time to search for the Golden Butterfly, recruiting the help of a young Faragonda.