Winx Club: Season 5, Episode 12

5 - 12: Sirenix

Tritannus and the Trix steal Daphne's damaged Sirenix energy and magical power. Tritannus manages to grant the Trix an evil and darker version of Sirenix. Meanwhile, the Winx Club have collected all three mystical gems and gain full access to the Sirenix transformation and tremendous ocean/sea-themed power, and they enter the infinite ocean itself through a portal. Tritannus has all of the Selkies magical abilities, and together with the Trix, he enters the infinite ocean as well.