School for fairies Alfea celebrates the inauguration of the new school year when the party is interrupted by Icy, Darcy and Stormy, the perfidious Trix. The Winx without Bloom, are forced to remedy the confusion created by the witches who, having ruined the party, steal a powerful and mysterious object. Meanwhile, Bloom is on Domino, which is experiencing the best moments of his new life as a princess. He finally found his parents and Sky asks her to marry him. But not all gold that glitters, the three Witches are Ancestors in fact come back to haunt Stella, Aisha, Tecna, Musa, Flora and Bloom. Moreover, Erendor, Sky's father, forbids his son to marry the princess of Domino. A dark secret lies in the realm of Eraklyon and now that Sky, the legitimate ruler of the kingdom, as known.