The Great Dragon has been set free and fully enraged turns his violent hatred towards Camelot without pity.
The castle is crumbling down and Arthur and his men realize they won’t be able to hold out for much longer. The only way to defeat the Dragon appears to be a Dragonlord, but Uther wiped them all out of the kingdom years ago. However, Gaius admits that there might be one of them alive and hiding.
The last Dragonlord becomes not only the only hope of future for Camelot but also a key to Merlin’s own past. Will Arthur and Merlin manage to find Balinor in time to save the kingdom and persuade him to return to Camelot to save his enemy, Uther?