The Winx reach Valtor's palace to try to defeat it and take the other prime stars. The group attacks the castle attracting the Trix to the outside and, while Bloom, Musa and Tecna face them, Stella, Aisha and Flora take on the appearance of the three witches to try to catch the stars; however, as they try to deceive Valtor, the real Trix return, forcing the Winx to fight against the wizard, who has turned into a gigantic demon monster. After hearing from Bloom that Valtor intends to destroy the Magic Dimension, Icy does not know who to give the prime star in his possession, but in the end she delivers it to the Winx in order to be able, one day, to save Dyamond and her younger sister.