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.

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.

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