"Winx Club" returned to Nick with an hour long episode that included episode 2, “The Legendarium,” and episode 3, “The Flying School.” The season six premiere, “Inspiration of Sirenix,” aired a month ago. In it, the Winx fairies helped Bloom’s sister Daphne regain her confidence in using her magic.
The new episode begins with the fairies returning to Alfea College, where Daphne is now the History of Magic teacher. Stella has opened a fashion boutique featuring her designs at the school without permission. She makes it disappear when Assistant Headmistress Miss Griselda shows up, calling the fairies to gather with the Alfea students for an assembly.
At the assembly, Miss Faragonda is interrupted by the arrival of pixies, who have come to celebrate her 100th anniversary as Headmistress. Everyone follows the pixies out to the courtyard for the party.
At Cloudtower School, the students are also gathered for a beginning-of-term assembly. Miss Griffin calls on Selina, a new student, to demonstrate her powers. Selina says that she is from Earth, and she possesses a magical book called the Legendarium. The Legendarium allows her to bring myths and mythical creatures to life and to control them. Miss Griffin asks for a demonstration. Selina brings the Gloomywood trolls, which were defeated by the pixies, to life and sends them to attack the pixie village.
The pixies contact their friends at Alfea, and the Winx go to fight the trolls. They’re unable to stop the attack because as soon as they defeat the trolls, more come up out of the ground.
Back at Cloudtower, Miss Griffin tells Selina to stop the attack, but when Selina recalls the trolls to the book, some pixies are trapped in the book with them. The fairies and pixies in the village are shocked to find that some of the pixies have disappeared along with the trolls.
The Trix arrive at Cloudtower. Miss Griffin orders them to leave, but they attack her, turning her into a crow. She goes to get help from Alfea. The Cloudtower students align themselves with the Trix. The Trix turn Cloudtower into a flying building and leave to conquer the other magical schools. Selina agrees to use the Legendarium to help the Trix.
The Winx and their pixies return to Alfea to ask Miss Faragonda what to do about the missing pixies. As they approach the school, they spot the crow (Miss Griffin) falling from the sky and rescue her. Miss Faragonda gets Roxy to figure out a way to communicate with the crow.
Meanwhile the Specialists are at Linfea College for special training. Sky’s cousin Thorin is there with his fellow Paladins. (Thorin and Sky don’t get along.) Timmy contacts the fairies to invite them to join the training class. At Linfea, Flora meets her sister Miele, a student there. She shows Flora around the grounds and points out “human trees,” like the ents from “The Lord of the Rings.”
Back at Alfea Roxy takes the crow to see Miss Faragonda, having taught it to speak a little. The crow warns Miss Faragonda about the Trix taking over Cloudtower. Miss Faragonda figures out that the crow is Miss Griffin.
Back at Linfea, Cloudtower arrives at the college. Selina uses the Legendarium to make the special trees come to life and attack. The fairies see Cloudtower and head there to investigate. They discover the Trix and a battle ensues. Selina creates a magical orb around her to protect the Legendarium. The fairies attack the Legendarium, but hit the orb and all but Bloom lose their powers. They’re rescued by the Specialists. The Trix conquer Linfea College and the Winx and Specialists flee to Alfea.
At Alfea, they fairies report what happened to Miss Faragonda. Bloom shares her dragon flame power with the other Winx.
In the next episode, the Trix are in control of Linfea College, and the fairies work to regain their strength.