Previously banished to the Omega Dimension, the Trix are able to escape with Valtor, a sorcerer partially responsible for the destruction of Bloom's home realm, Domino. They choose to cooperate and they plan to invade several areas in the realm of Magix and seek vengeance on those who imprisoned them, stealing the magic treasure and power source from each realm. The Winx Club begins its third year in Alfea and the girls learn about their unique Enchantix transformations, acquired by showing examples of courage and altruism.
Enchantix is the final and most powerful form for all fairies. To attain it, they must make a sacrifice for one person from their home planet, or make a grave sacrifice. When the girls get their Enchantix, they gain ample wings that are entirely different from their original wings and new, beautiful, and unique outfits. While in Enchantix, their Winx is multiplied dramatically to the extent that their powers reach levels high enough to achieve amazing feats.