5x1 - The Spill

October 16, 2012

In the kingdom of Andros, Aisha's uncle Neptune plans to make his son Nereus a prince, Nereus's twin brother disrupts the crowning ceremony and is sent to prison.

5x2 - The Rise of Tritannus

October 17, 2012

The Winx change their concert, into a benefit to help clean up the oil spill. Meanwhile Tritannus escapes from jail with the help of the Trinx and begins absorbing the oil spill's pollution and slowly begins transforms into a monster.

5x3 - Return to Alfea

October 18, 2012

The girls all head back to Alfea to talk more with Ms. F and read up o a book called The Sirenix. While in the library they are attacked by both the Trinx and Tritannus: who is getting stronger. Sky takes a hard blow to the head.

5x4 - The Sirenix Book

October 19, 2012

Krystal attempts to heal Sky's memory, but the memory of losing the pendant of Eraklyon is causing the blockage, but only Sky knows where it can be found. Timmy helps Tecna update her phone to find the Sirenix Book, which the Trix secretly sabotage. While, searching for the Sirenix Book, the Winx find the fake one, which turns Tecna into a terrifying robot, whose mission is to find the Sirenix Book.

5x5 - The Lilo

October 22, 2012

The Trix show their powers, wondering if they are strong enough to go up against The Winx Club. As the Trix get stronger, so do the Winx.

5x6 - The Power of Harmonix

October 23, 2012

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.

5x7 - The Shimmering Shells

October 24, 2012

After suffering a humiliating defeat at the hands of the Twisted Sisters, and Tritannus, the girls all head to Aishas underwater world to visit personally with her uncle Neptune. There they meet Pescies, who are the Underwater Pixies of the Sea. The Winx try to get the 'mystical stone: self-confidence" as part of their mission for Sirenix.

5x8 - Secret of the Ruby Reef

October 25, 2012

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.

5x10 - Trix Tricks

October 29, 2012

During a day of races that are taking place at Alfea with current, & past students of Red Fountain, the Trix attack and create lions out of dark magic to fight the Winx for them.

5x11 - Test of Courage

October 30, 2012

Bloom and some of her friends head to her home world for a celebration, along with Sky. However it is interrupted when the witches cause trouble underwater. Sky is left along with Blooms parents when the are attacked.

5x12 - Sirenix

October 31, 2012

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.

5x13 - A Magix Christmas

December 9, 2012

Bloom's plans to head home for Christmas are interupted by the Trix. They have trapped the girls at their old school with Ice dragons to keep them at bay.

5x14 - The Emperor Throne

February 17, 2013

After having a picnic on a dirty beach the Winx decide to clean it up, while Stella tries her hand at a fashion show. Meanwhile Tritannusgains more power, but looses his toxic one.

5x15 - The Pillar of Light

February 24, 2013

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

5x16 - The Eclipse

March 3, 2013

As darkness envelopes the magical worlds, everyone looks to Stella to help save them and her father's life.

5x17 - Faraway Reflections

March 10, 2013

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

5x18 - The Devourer

March 17, 2013

5x19 - The Singing Whales

March 31, 2013

5x20 - The Problems of love

March 31, 2013

5x21 - A Perfect Date

April 7, 2013

5x22 - Listen to your heart

April 14, 2013

5x23 - The Shark's Eye

April 19, 2013

5x24 - Saving Paradise Bay

April 22, 2013

5x25 - The Last Discovery

April 23, 2013

5x26 - The Fall of Tritannus

April 24, 2013