Lucy and Edmund Pevensie are stranded in Cambridge, living in the house of their obnoxious cousin Eustace, while the grown-ups Susan and Peter are living in the USA with their parents. When a painting of a ship sailing on the sea of Narnia overflows water in their room, Lucy, Edmund and Eustace are transported to the ocean of Narnia and rescued by King Caspian and the crew of the ship The Dawn Treader. Caspian explains that Narnia has been in peace for three years but before he took his throne back, his uncle tried to kill the seven lords of Telmar, who were the closest and most loyal friends of his father. They fled to The Lone Island and no one has ever heard anything about them. Now Caspian is seeking out the lords of Telmar with his Captain Drinian, the rat Reepicheep and his loyal men. Sooner they discover that an evil form of green mist is threatening Narnia and the siblings and their...

When the Pevensie family are evacuated out to the country, they are unaware of the adventure they will encounter. During a game of hide and seek, the youngest daughter, Lucy (Henley) discovers a wardrobe which transports her to the land of Narnia. Covered in snow, Narnia is full of weird and wonderful creatures, but is watched over by the evil White Witch, Jadis (Swinton). When all four Pevensie children end up through the wardrobe, they discover that it was meant to be, as two daughters of Eve and two sons of Adam must join with the mighty lion, Aslan (Neeson) to defeat the evil White Witch.

The four Pevensie children return to Narnia, only to discover that hundreds of years have passed since they ruled there, and the evil King Miraz has taken charge. With the help of a heroic mouse called Reepicheep, and the exiled heir to the throne, Prince Caspian, they set out to overthrow the King, once again with Aslan's help.