@ViaCom
@Rainbow S.r.l
@Nickelodeon

New school year begins in Alfea. Headmistress Faragonda warmly welcomes all returning and new students, especially introducing Roxy. The Winx return to Alfea to consult with Faragonda on how to deal with Tritannus as their Believix powers lose effectiveness in the water. She brings up the matter of the Sirenix power, which could give the girls an edge against the new threat. However, the book containing the secrets is hidden somewhere in Alfea, that even Faragonda herself doesn't know its exact location. The only one who does is Daphne. Bloom sets out to talk with Daphne and asks about the book's location, but the ghostly fairy is reluctant to tell her since the Sirenix is too dangerous to use as she knows firsthand. Daphne relents and tells Bloom it's in the secret archive of the library. As the Winx go to find the book, the Trix break in and a fight ensues. The girls have a bit of trouble since the Trix had gotten a serious power-up from Tritannus to overcome the Believix. Icy gets Bloom cornered as as she was about to deal out the killing blow, Sky intervenes and takes the hit for her and falls from a great height. Once Faragonda and Griselda arrive, the Trix retreat. Bloom frantically checks Sky's condition, and was elated to see him awaken, but he lost his memory when he fell.