The Winx leave Magix for Earth (Gardenia). They open the "Love & Pet" shop and hunt for the last Earth Fairy, Roxy. The antagonists are the Wizards of the Black Circle, who hunted fairies to extinction on Earth.
Bloom becomes the new Keeper of the Dragon Flame. The villain Selina uses the Legendarium Book to bring myths and legends to life. The Winx unlock Bloomix (a transformation powered by the Dragon Flame) and later, Mythix.
Episodes: 26
Avoid the "Nickelodeon 3D Specials" if you want the original canon.
The season that started it all. We meet Bloom, a seemingly normal Earth girl who discovers she is a fire dragon fairy. She enrolls at Alfea, meets Stella, Flora, Musa, Tecna, and Layla (Aisha), and faces the ancestral witches of Cloud Tower: Icy, Darcy, and Stormy.