Princess Gwenevere and the Jewel Riders, aided by their male counterparts, The Pack, embark on a rescue mission to save Sunstar from Lady Kale's Thornwood Castle. Kale demands the key to the Jewel Box in exchange for the captive unicorn, but Merlin at last moment uses his remaining powers to scatter the Seven Crown Jewels to their original lands and the Jewel Riders manage to set Sunstar free. In order to become a Jewel Rider, Gwenevere enters the revered Circle of Friendship to bond with Sunstar as her magical animal, sharing the Sun Stone with her. But with the Crown Jewels gone from Merlin's Jewel Box, the Wild Magic in Avalon is no longer stable and a great quest to recover the lost Crown Jewels begins.