The Winx must save the Fairy Animals from the evil Kalshara and her brother Brafilius, answering to the various calls for help from every corner of the world, till their final mission: discover the Ultimate Power of Fairy Animals, which can give its owner control over all the animals of the Magic Universe.
The Winx Club notices that some of the stars in the sky are disappearing. They determine that the return of Valtor is linked to the strange occurrence. The fairies travel to Lumenia, the Magic Dimension's brightest star and the light source for Khia’s home planet of Solaria. Lumenia's queen gives them the power of Cosmix to protect the magical universe's billions of stars. Along the way, the Winx also meet Dora; a helpful golden creature who powers the very core of Lumenia.
The Winx Club begins their third year at Alfea and learn about Valtor, the new villain for Season 3. He is an evil wizard trying to destroy the Winx and conquer Magix with the Trix's help. The Winx earn a new transformation; Enchantix. With Enchantix, Water Stars, and fairy dust, they are able to destroy Valtor and regain peace in the Magic Dimension.
The Trix come back and start to conquer all the Magic Dimension colleges. Following the Trix’orders, a new witch called Selina summons a lot of legendary creatures from her powerful book, the Legendarium. The Winx will have to fight hard against them!
All the oceans of the magic worlds are endangered by Tritannus, a mutant monster who, spreading pollution, is able to turn sea creatures into mutants under his control. To stop him, the Winx will have to undertake a challenging mission: they will have to search for the Fairy Gems and then go into the Infinite Ocean after getting the amazing Sirenix power.
A dark menace is hidden on Earth and is ready to show up, releasing its destroying fury against the humans. The Winx will be ready to face it with a new, precious, ally: Roxy, the Fairy of Animals!