5x1 – Die Öl-Katastrophe
In the kingdom of Andros, Aisha's Uncle Neptune plans to make his son Nereus Crown Prince. The ceremony is disrupted when Nereus' twin Tritannus attacks, and is sent to the prison of Andros where he meets the Trix.
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5x2 – Neue Macht für Tritannus
Tritannus has his cousin, Aisha, in his clutches. She is a critical part of his plan for dimension domination. Could evil possibly prevail?
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5x3 – Rückkehr nach Alfea
The Winx learn that to defeat Trtiannus, they must gain a new power; Sirenix. Bloom's sister Daphne warns Bloom of the dangers of Sirenix. But when looking for the book of Sirenix, another danger threatens Bloom's future.
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5x4 – Das Sirenix Buch
The Winx use Tecna's tech-savvy skills to find the Sirenix Book, but the Trix meddle with the Winx' search. When Tritannus learns of the Winx' mission to achieve Sirenix, he too, seeks to obtain it.
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5x5 – Die Lilo-Blume
The Winx and Trix race to find the Lilo, a magic plant, which will bloom for the first time in centuries. When the people of Gardenia stand up for the Winx, the Winx are able to defeat the Trix and the Lilo blooms.
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5x6 – Die Macht des Harmonix
The Winx compete in the Challenge of Graynor, in hopes of winning a power that will help them open the Book of Sirenix. Will they be able to identify and protect Graynor's most beloved creature?
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5x7 – Die schimmernden Muscheln
The Winx face their first challenge of Sirenix and obtain the gem of self-confidence. Meanwhile, the Trix and Tritannus' mutants attack Gardenia in order to spread more pollution.
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5x8 – Das Geheimnis des rubinroten Riffs
A musical riddle from the Sirenix book sends the Winx to Melody, but Tritannus throws a monstrous wrench in their plan. The Winx's quest for the two remaining gems continues.
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5x9 – Der Juwel des Mitgefühls
With Tritannus on their tail, the Winx travel to Zenith to obtain the Gem of Empathy. Musa and Flora stay back to watch over a very temperamental Stella. Time is running out for the Winx to complete their quest.
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5x10 – Zauberhafte Weihnachten
When the Trix send terrifying Ice Dragons after Bloom, she is stuck at Alfea for Christmas. It is up to the Winx to defeat the Trix and bring their own holiday "cheer" to Bloom. Can they get Bloom home in time for Christmas?
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5x11 – Die Tricks der Trix
The Trix and Tritannus torture Daphne to find out how to get Sirenix, then crash the Redfountain Windrider competition. Meanwhile the Winx go to Lynphea to find the Flower of Depths and a clue to the Gem of Courage's location.
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5x12 – Die Mutprobe
Back on Andros, when the Winx find the cure for Aisha's blindness, Aisha must choose between her sight and saving Queen Ligea. Will Tressa, Aisha's cousin, find the courage to lead them to victory?
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5x13 – Sirenix
Tritannus uses Oritel and Marion as bait to learn more about Sirenix from Daphne. With their three gems and the power of Sirenix at their fingertips, the Winx prepare to enter an incredible and new frontier as fairies.
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5x14 – Der Herrscherthron
The Winx start a movement to clean the trash from Gardenia's beach. With their new Sirenix powers, Tritannus and the Trix head to the Emperor's Throne, but quickly discover that not everything is as expected.
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5x15 – Die Säule des Lichts
To activate the Emperor's Throne, Tritannus must obtain the seals for the throne's missing pillars. When he takes the seal from the Pillar of Light, the planet's light is fading away, and it is up to the Winx to restore order.
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5x16 – Die Sonnenfinsternis
Time is running out before darkness envelopes the Magic Dimension. All eyes are on Stella, the Fairy of the Shining Sun, to help restore light and save her ailing father.
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5x17 – Ferne Reflexionen
As Daphne is held captive by Tritannus, she tries to warn Bloom of his dangerous plans. In Gardenia, Mike and Vanessa's attempt to clean up Garbage Island is disrupted when Tritannus sends a monster to attack.
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5x18 – Der Allesverschlinger
Tritannus sends a hungry beast after the Selkies so that he can get to the Pillars. It's up to the Winx to apply their training and use their skills to save the Selkies and stop Tritannus.
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5x19 – Die singenden Wale
Tritannus takes the Seal from the Pillar of Balance. The planets are shaken, and Melody's Singing Whales disappear. In order to restore the Pillar and return the whales, the Winx must fight Icy and Tritannus.
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5x20 – Liebesprobleme
Musa relies on a childhood lullaby to restore harmony in the sea. The Winx must now hone their understanding of the natural world and it's creatures to defeat Tritannus.
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5x21 – Ein perfektes Date
The Winx and Specialists plan a proper face to face date for Tecna and Timmy. How will the texting couple handle a romantic dinner for two? And will the Winx be able to fare without the help of Tecna?
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5x22 – Hör auf dein Herz
The Sovereign Council must agree on how to protect the Magic Dimension. King Cryon of Zenith plans to look out only for his planet using an army of robot droids. But are the droids truly the best answer?
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5x23 – Das Haifisch-Auge
Daphne tells Bloom about a nymph Politea, who is under a dark spell. Politea's Sirenix power could be what Tritannus needs to become Emperor of the Infinite Ocean, but Darcy and Stormy are determined to keep this from happening.
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5x24 – Die Rettung der Paradiesbucht
The Magic Dimension's future is hanging by a thread. Bloom and Sky lead the Sovereign Council in agreement to unite and fight Tritannus. But first the Winx must find the Breath of the Ocean in order to save a polluted bay.
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5x25 – Der Kampf um den Unendlichen Ozean
The time has come to bring Tritannus and Icy down. An epic battle ensues with all of the planets' forces uniting as one. Bloom and the Winx must stop Tritannus before he activates the Emperor's throne. But will it be too late?
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5x26 – Das Ende von Tritannus
Tritannus has his cousin, Aisha, in his clutches. She is a critical part of his plan for dimension domination. Could evil possibly prevail?
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