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.

Nebula captures Morgana and conquers the magical kingdom of Tir Nan Og. Then, she leads her army into the Omega Dimension where the remaining Wizards are hiding. After freeing Morgana, Roxy discovers that she is Morgana's daughter. Later, the Winx girls must face Nebula's vengeful army, led by their new lieutenant — Layla. Morgana and the Winx girls are able to convince the Fairies of Vengeance not to seek revenge, but now must also convince Layla and Nebula of the same.

Next, the Winx must retrieve the Silver Spear, said to be hidden in a forest town on Earth where werewolves roam after dark.

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

The Winx need to get Musa's voice back from Rumpelstiltskin, but he demands something from them that they're not prepared to give.

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 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.

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.

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.

Tritannus raids King Neptune’s underwater palace and transforms his whole mer family into mutants. Then, thanks to the dark magic of his trident, he manages to absorb all of the magical strength and energy of his father, King Neptune’s, mystical sword. Meanwhile, the Winx Club get a second clue to Sirenix which leads them to Musa's home world, Melody, busy searching for the second gem, the one of Empathy. During a fight with Tritannus, Musa is hit by a powerful dark spell and transforms into a terrible monster, bent on destroying the Winx. The Trix arrive with Tritannus on daphne`s doorstep and force her to tell them about Sirenix.

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.

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

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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.

Daphne makes a big announcement: She's getting married to Thoren! But back in Cloud Tower, Selina successfully frees the evil Acheron into the world.

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.

Something has caused the weather in Ethiopia to go haywire. To get to the bottom of it all, the Winx enter the Sundial MiniWorld.

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.

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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.

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.