Technically, no. The show does a decent job of recapping necessary information. However, you will miss major character development—specifically regarding Bloom's parents and her relationship with Sky—if you skip Secret of the Lost Kingdom and Magical Adventure .

This movie focuses on the Sirenix power and the return of the Trix and Politea. It takes place primarily underwater and follows the events of the fifth season. Quick Watch Summary Season 1 - 3 Movie 1: The Secret of the Lost Kingdom Season 4 Movie 2: Magical Adventure Season 5 Movie 3: Mystery of the Abyss Season 6 - 8

Do not watch the 3D animated Netflix special Fate: The Winx Saga . It is a live-action, dark reimagining for young adults, entirely separate from the animated movie canon.