Bloom is an ordinary girl living on Earth with her parents, Mike and Vanessa, and her pet rabbit Kiko. While on summer vacation, Bloom spots a battle between a fairy, Stella, and an ogre, Knut. As Stella's magic sceptre is stolen, she intervenes, discovering that she has magical powers and manages to turn the tide. While Knut and his ghouls retreat, Stella faints and Bloom returns with her to her house. That night, Stella awakens and suggests that Bloom attends Alfea, a school for fairies to fully master her new powers. As the two talk, Knut returns with more ghouls and a hunting troll, and launches a surprise attack. While Stella transforms and manages to hold them off temporarily, she is quickly overwhelmed. Just as the creatures try to finish her, four warriors known as the specialists named Timmy, Riven, Brandon and Prince Sky capture the troll while Stella and Bloom knock out Knut using magic blasts, Bloom again tapping into her latent magic. The next morning, Bloom decides to leave for Alfea.

Bloom arrives at Alfea but lies about her name and says she's Princess Veranda (anyone who is not on the list will be turned into something slimy). Stella introduces Bloom to her roomates - the other Winx Club members. The Senior Witches and Mr. Knut show up again and almost kick Bloom's butt until the other 4 Winx members kick their butts.

The Winx Club members and the warriors prepare for the school dance; the witches try to steal Stella's ring. Bloom takes on the witches by herself and transforms for the first time, but loses Stella's ring.

The aspiring fairies experience their first outdoor exercise at the Black-Mud swamp. The troll is being transported to the Magix Prison by the Specialists. They have to apply all their magical powers to escape from this life-threatening maze.

Stella receives what she believes to be an invitation for a date from Prince Sky, however it's actually the witches up to their tricks! They confront the witches but they are defeated and compelled to hand over Stella's ring to the triumphant witches.

The Winx Club attempts to go to Cloud Tower to get Stella's ring back, but are in for more then they bargained for, when they are surrounded by beetles! Stella burns one of the beetles, but ends up surronding them with fire! Bloom hears a voice in her head telling her to escape through an invisible door.