At Alfea College, Stella, Aisha, Flora, Musa, and Tecna all graduate and become fairy guardians of their home planets. But, Bloom must watch graduation from the sidelines. The Winx try to save Bloom's parents and the planet.
The girls discover a new high school, but soon realize that the school is for supervillains. Wonder Woman, Harley Quinn, Poison Ivy, Supergirl, Batgirl, Katana, and Bumblebee come together ...