After Kilgharrah burnt down many parts of the Kingdom, killing many innocent people in the process, Arthur and Merlin went to find the last Dragonlord Balinor, who was killed during an ambush by King Cenred's soldiers. Arthur, unaware that the Dragonlord gift had been passed on from Balinor to Merlin, chose to face Kilgharrah himself in the woods along with some Knights of Camelot. Kilgharrah then arrived and easily defeated the Knights, killing many of them (except for Sir Leon) before facing Arthur.
The duel began when Arthur grabbed a spear and looked at Kilgharrah for a moment until Kilgharrah breathed fire at him. Arthur narrowly dodged the attack and impaled Kilgharrah with the spear which only wounded him slightly. Enraged by this, Kilgharrah struck Arthur with his paw, knocking him unconscious. Kilgharrah was only stopped when Merlin used his new Dragonlord power to force Kilgharrah out of Camelot.