Four young knights, Rohan, Deirdre, Angus and Ivar, defend their ancient homeland of Kells from attacks by the evil Queen Maeve who is intent on ruling the island kingdom. The knights bravely resist Maeve's dark sorcery, battling giants, ogres and evil mythical creatures. Their quest to restore peace to the land leads the knights to discover their mystic armor and their dragon ally, Pyre, who joins them on adventures filled with danger, magic, and the roguish little people who inhabit the enchanted underworld of Tir Na Nog.
A messenger from Ivar's home requests his return as news comes of a new Temra attack. Both are part of a plan by Maeve to separate the Knights while she uses sleeping fog to take over Kells.
On an errand for Cathbad, Deirde drinks from a magic pool that turns her into a hag. When she goes to Fin Varra for help, he's taken by her new appearance and shrinks her down to be with him.
In order to forge an alliance, Conchobar agrees to marry Deirde to Garrett, a prince of another land. His arrogance soon rubs all the Knights the wrong way and they tell him to leave.
Maeve uses a spell on Garrett to turn him into her fighter. He soon manages to defeat the Knights and steal their weapons.
Told that Garrett is important to the future of Kells, the Knights manage to free him from his spell.
Garrett must overcome his arrogance in order to become the new Mystic Knight when he fights a giant spider in Banshee Woods. While Garrett is tangling with the giant spider, Mider summons four of the Spectres of the Banshee Woods to fight the other Knights.
