The Winx Club is back!
Now they will have to reach the Believix level, a new transformation that grants the ability to make someone believe in magic. In addition, Believix also gives 3 additional wings to make the form more powerful: Speedix (speed enhancement), Zoomix (teletransportation), and Tracix (seeing the past).

They will also meet the Wizards of the Black Circle, a group of villains who are after the last fairy on Earth, in order to gain full power. The Winx Club will have to find and protect her from the the Wizards, but they have to go unnoticed! In order to live on Earth, they will open a pet shop named Love&Pet and soon enough,meet Roxy, a girl who works at the Frutti Music Bar, a place near Gardenia's beach.

Soon they will find out that Roxy is the last fairy on Earth! In the process, Roxy is able to discover her powers, to believe in herself and also in the fairies of the Winx Club. She'll turn into a fairy and will help the Winx drive away the Wizards and rescue the imprisoned fairies. However, the fairies are seeking revenge on humans for not having believed in them...

The Winx Club are, then, forced into an uneasy alliance with the Wizards as they now race to save humanity.
Will the Winx Club prevail?