The Winx Club is struggling with a terrible mystery that will make your heart beat faster! The archenemies of the Winx Club, the Trix witches, team up with the evil nymph Politea and find out that, to defeat the fairies once and for all and become invincible, it takes very little: a Pearl hidden in the Deep of the Infinite Ocean! Get ready: the most dangerous mission of the Winx is about to begin!