Lucy and Edmund Pevensie, along with their cousin Eustace Scrubb, are magically transported back to Narnia. They join King Caspian aboard the ship Dawn Treader on a quest to find the Seven Lost Lords. Their voyage spans mystical islands and high seas, featuring:
Invisible ducass, a menacing dragon, and memory-erasing pools
Moral challenges and supernatural discoveries
Eustace's redemptive transformation
 
The journey culminates at the edge of Narnia’s world, where the children meet Aslan again before finding their way home .