Winx Club: The Secret of the Lost Kingdom

Bloom and her Winx set out to locate Bloom's birth parents, King Oritel and Queen Marion. They sneak into Hagen's castle and plead for help, but Hagen admits he cannot assist. The mission ends with the group returning to Alfea empty-handed, leaving Bloom feeling guilty and more determined.

Most of the third-year fairies graduate and become guardian fairies, while Bloom stays behind with incomplete powers. Sky consoles her during a tender moment that is interrupted by the sudden arrival of a mysterious girl. The scene sets the stage for Bloom's continuing quest.

Bloom travels to Earth to live with her adoptive parents, masking her true longing for the Magical Dimension. That night, she dreams of her sister Daphne, who reveals their parents are alive and hints at the Book of Fate. The dream hints at the power and peril of the fate surrounding Bloom.

The next morning, Bloom's friends gather to celebrate her nineteenth birthday and pledge to support her plan. The reunion strengthens their bond as they prepare to pursue clues about her parents and the Book of Fate. Their unity signals a renewed, dangerous commitment.

Bloom's renewed hope triggers the activation of Oritel's ancestral sword, drawing the attention of the Obsidian Circle. The Ancestral Witches enlist Mandragora to investigate and eliminate the source of Bloom's power. The stage is set for a clash between light and darkness.

Guided by Daphne's mask and memories, the team travels to Domino to reach the Book of Fate. They navigate the mountains and meet the Roc, a powerful guardian, whose awakening causes chaos but is ultimately controlled. The group lands the Roc safely and continues their journey.

Inside the library, Bartelby reveals the Book of Fate and explains Bloom's parents were part of the Company of Light. They learn crucial pages are missing and hear a prophecy about six legendary warriors and a king without a crown saving Domino. The revelation deepens Bloom's sense of destiny.

Mandragora attacks Alfea and probes Bloom's vulnerability while the Winx fight to restore their home. Amid the chaos, Riven falls under Mandragora's sway, threatening the team. The attack triggers a major setback in their mission.

Seeking access to the Obsidian Circle, the girls consult Lockette at Pixie Village and approach the gateway, but Mandragora intervenes and pits Riven against Sky, endangering Musa. Tensions rise as the path into the Circle becomes perilously unclear.

The team confronts their fears and Bloom has a vision of her birth parents' past: Oritel is pulled into the Obsidian Circle while Marion merges with the sword to stay with him. The fairies awaken and face a grave choice between destroying the sword or saving their loved ones. The vision crystallizes the stakes of their mission.

The battle intensifies as Bloom channels Dragon Flame. Sky arrives to help but is presumed dead after taking the sword, since only a king can wield it. The confrontation tests Bloom's resolve to use her power to its limit.

With Daphne's support and the others' aid, Bloom destroys Mandragora and the Obsidian Circle, freeing Oritel and Marion. Sky's fate is clarified as he becomes king, Domino is restored, and Bloom reunites with her birth parents. The victory marks Bloom's completion of her Enchantix and a new beginning for the Winx.

In a grand celebration, Oritel and Marion dance with Bloom while Sky proposes. Bartelby appears to declare that the prophecy is fulfilled and that Bloom is now a guardian fairy of the reformed Company of Light—the Winx. The crowd cheers as the heroes begin a peaceful new era.

The post-credits scene reveals the Ancestral Witches have not been destroyed; their spirits endure and seek new hosts, including the Trix, setting up a looming threat for the sequel.