The Guardians must save Meridian from the evil sorcerer Phobos and Cedric who are searching for Phobos' sister, the long lost princess of Meridian and true heir to the throne. They later find her and the Guardians then set about saving her from Phobos. When Meridian is freed from evil and true heir takes the throne, a new mysterious sorceress named Nerissa frees Phobos' top henchmen and reforms them as the Knights of Vengeance. Once the Guardians learn more about the sorceress and her evil plan of reuniting former Guardians, they are able to defeat the Knights only to have more powerful Knights of Destruction, in addition to the former Guardians attack them. The Guardians' chief ally is Hay Lin's grandmother Yan Lin, a former Guardian herself, and the one that taught the girls about their magical destiny. They are also helped by Caleb, a heroic soldier from Meridian, leader of the rebellion against Phobos, and Blunk, a frog-like goblin creature (known as a Passling) who takes things from the human world to Meridian (and vice-versa), humorously mistaking everyday objects for other things or items of value. Matt, Will's boyfriend, accidentally learns about Meridian and when he sees the troubles there going on, he learns how to become a warrior to help them. They are also helped by the Oracle, leader of the Universe in Kandrakar, who was the one who chose the Guardians.