Eustace Scrubb is magically transported to Narnia along with his cousins Edmund and Lucy Pevensie. Eustace meets King Caspian and joins the voyage of his ship the Dawn Treader, but remains critical of everything he sees and experiences in Narnia.
Eustace is transformed into a dragon. His experience teaches him about his own flaws and self-interest.
Restored to human form by the lion Aslan, Eustace gradually begins to change into a brave, loving, good-hearted adventurer like his cousins.