In 2010, it was publicly announced that Nickelodeon gained the rights for Winx Club in several countries, after 4Kids had lost their rights for Winx Club, and that it will be co-producing Seasons 5 and 6 along with Rainbow.
Season five began airing in August 26, 2012 in the USA on Nickelodeon, and from October 16, 2012 it aired in Italy and most other countries as a Global Premiere.
Season 5 has been named Winx Club: Beyond Believix on Nickelodeon (similarly to how Season 4 was named Winx Club: The Power of Believix and how Season 3 was named Winx Club: Enchantix). Now, the battle cry is "Magic Winx! Harmonix!" and later, "Magic Winx! Sirenix!".
This season is also more strongly connected to past seasons through references and character cameos than the Season 4 was. The first thirteen episodes aired to America between August 26, 2012 and November 25, 2012. A Magix Christmas aired Sunday December 9, 2012 at 1/12c on Nick.
After the thirteenth episode, the show went on a three-month hiatus and returned with new episodes on February 17, 2013. The season came to an end on April 24, 2013 in Italy and September 22, 2013 in America.
The Winx Club are back. This time the Winx will have their journey underwater and will have to face a new dreadful villain, Tritannus. He was a normal triton who was mutated into a powerful monster caused by pollution. His main goal is to rule all the world by entering the Infinite Ocean!
The Believix power is not strong enough underwater, as the Believix wings are useless when they become wet hence the Winx start a challenging quest to get the ancient Sirenix power and become Ocean Fairies.
Wonderful sea creatures such as the Selkies will help the fairies in this “Underwater Mission”. Will the Winx manage to save the Magic Dimension? Will they prevent Tritannus from becoming the evil Emperor of the Infinite Ocean?
- The Spill
- The Rise of Tritannus
- Return to Alfea
- The Sirenix Book
- The Lilo
- The Power of Harmonix
- The Shimmering Shells
- Secret of the Ruby Reef
- The Gem of Empathy
- A Magix Christmas
- Trix Tricks
- Test of Courage
- The Emperor's Throne
- The Pillar of Light
- The Eclipse
- Faraway Reflections
- The Devourer
- The Singing Whales
- The Problems of Love
- A Perfect Date
- Listen to Your Heart
- The Shark's Eye
- Saving Paradise Bay
- Battle for the Infinite Ocean
- The End of Tritannus
- The Trix returned in Season 5 after being absent in the fourth season.
- After being on Earth most of Season 4, the Winx finally return back to Alfea.
- The Winx, once again this season, have new civilian outfits.
- Roxy appeared in the Season 5, but as a minor recurring character.
- From the rightful sources, it has been officially confirmed directly from Rainbow that "The Lilo" is the fifth episode created for Season 5, however, it is not the proper fifth episode of the main season 5 story arc. "The Lilo" is a stand-alone episode, which both Nickelodeon and Rainbow agreed was the episode chosen to use to launch Season 5. Despite this, "The Lilo" was aired as the fifth episode in Italy.
- Along with "The Lilo", "A Magix Christmas" is also a stand-alone episode and is not counted in the continuity in USA, as the narrator introduced "Trix Tricks" as the episode after "The Gem of Empathy". Despite this, "A Magix Christmas" is still the tenth episode.
- Several characters that appeared from seasons 1 to 4 (including the movies) all appeared in this season.
- Each Winx's home world was seen.
- The monarchs of the home worlds of the Winx were all seen.
- Tecna's home world, Zenith, finally making its debut after being mention from the first season.
- This is the first season to be animated in both 2D and 3D.
- This season also takes place where Season 4 leaves off with the Wizards of the Black Circle defeated and are frozen solid in the Omega Dimension.
- This season strongly focuses on the sisterhood of Daphne and Bloom; unlike previous seasons that focused on Bloom's search for her birth parents (Season 1 - 3 and first movie) and Roxy (Season 4).
- The Pixies had neither appeared nor mentioned this season.
- This will be the first season of Winx Club to feature two openings: a 2D opening for the first twelve episodes and a 3D opening for the remaining fourteen episodes.
- This is the first season to have spells released from the leg.
- Daphne's body is restored at the end of the season.