The Trix attack Bloom again. During the fight, they reveal themselves to be the Ancestral witches who centuries before destroyed the world of Domino while trying to steal the Dragon Flame. Bloom is defeated and loses all her powers to the three witches' advantage… Could she really be the last princess of Domino? 
 

After much persuasion, Faragonda finally agrees to let Bloom and friends explore the ruined world of Domino, hoping to find any possible trace of the Dragon Flame to save Magix! Meanwhile, Red Fountain is destroyed, and the boys flee to Alfea. When they arrive in Domino, the fairies are attacked by a monster created by Icy. The witch uses all her powers against the Winx. After a spectacular exchange of attacks, the fairies manage to escape Icy's ferocity, but the situation seems increasingly helpless as the tired and injured Winx continue to search. Will Bloom regain her power?