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.
Entering Tir Na Nog, Torc steals a powerful weapon that allows him to challenge the Knights.
Ivar finally manages to steal back his people's chalice from Torc. However, the chalice is Mider's link to the dark realms and taking it back to Ivar's kingdom is too dangerous. Ivar decides to take the chalice anyway but is captured by Maeve while Mider is left stranded at Castle Kells.
Conchobar is taken by a visiting lady but Deirdre senses something wrong about her.
In order to stop a storm of dark magic, the kings of Kells and Tir Na Nog must switch places for a day. While Conchobar organizes the fairies into a fighting force, Fin Varra's more fun ways with the Kells soldiers leave them vulnerable to attack.
After saving a wood elf, Angus is offered one wish and the other Knights pressure him to use it for their own desires.
The Knights must find the kidnapped Fin Varra before Maeve steals his powers.
