The Second Season of Winx Club premiered on September 10, 2005 through March 11, 2006. Layla, the Pixies and Helia are added to Winx Club in this season.
The season begins with Bloom, Stella, Flora, Musa, and Tecna returning from their summer vacation to begin their second year at Alfea. Shortly after the beginning-of-year party, a strange girl named Layla (Aisha) stumbles into the school.
Aisha tells the Winx that several Pixies, small flying fairy-like creatures, are being held hostage by Lord Darkar. Three of the girls and two Specialists travel to Darkar's stronghold and rescue the Pixies, then return to Alfea. During their trip to rescue the Pixies, Brandon gets dragged into a marriage with the Princess of Downland, Amentia, but gets rescued.
Meanwhile, the Trix have been locked in the Fortress of Light at Lightrock Lake. However, Lord Darkar breaks them out and gives them the Gloomix and enlists their service. Darkar and the Trix begin looking for the four pieces of the Codex, the key to the realm of Realix, where the Ultimate Power is contained.
Throughout the season, the Winx and Specialists attempt to stop the Trix from stealing each piece of the Codex. Near the end of the season, Bloom is turned into Dark Bloom by a minion of Darkar.
Also near the end of the season, the Charmix is introduced. The Charmix is a power-up to the magic Winx transformation, and consists of a chest pin and shoulder/waist bag. The fairy earns her Charmix by facing her fears.
At the end of the season, the Winx defeat Darkar with a final Charmix convergence and Layla joins the Winx Club.
- The Shadow Phoenix/Back to School
- The Return of the Trix/Princess of Tides
- Rescue Mission/Into the UnderRealm
- The Princess Amentia/Queen of Perfection
- Magic Bonding/Rescuing the Pixies
- The Wedding of Brandon/My Boyfriend's Wedding
- The Mysterious Stone/The Dark Tower
- The Crashed Party/Party Monster
- The Secret of Professer Avalon/The Angel of Doom
- The Crypt of Codex/Reaching for the Sky
- Race Against Time/Homesick
- Together for the Victory/Truth or Dare
- The Lady of the Ball/Gangs of Gardenia
- Battle on Planet Eraklyon/The Wrong Righters
- The Show Continues/Magic in My Heart
- Hallowinx!/The Fourth Witch
- Twinning with the Witches/Exchange Students
- The Heart of Cloud Tower
- The Spy in the Shadows/Shadows in Bloom
- The Village of Pixies/The First Charmix
- The Power of Charmix/Trouble in Paradise
- Wildland: The Great Trap/Last Resorts
- The Moment of Truth/Darkness & Light
- Prisoner of Darkar/Desperately Seeking Bloom
- Face to Face with the Enemy/Storming Shadowhaunt
- The Ashes of the Phoenix/The Ultimate Power Couple
As Nickelodeon did with first season, instead of showing the original second season, transmits just one-hour special that, as the previous three specials, follow the original storyline with new animation.
- The Girls of the Winx Club
- We Are The Winx (Instrumental Version)