The plot follows the quest of a young princess of Avalon, Gwenevere, and her fellow teenage Jewel Riders, Fallon and Tamara, to find and secure the scattered enchanted jewels so they can use them to stop the evil sorceress Lady Kale from taking over the kingdom, restore harmony in magic, and bring home their banished mentor Merlin. In the second season, the Jewel Riders receive more powers to compete against the returning Kale and the mighty new enemy Morgana for more magical jewels.