Myror was an assassin/bounty hunter sent to kill Arthur by King Odin, whose son Arthur had killed in a duel. Arthur pretended to leave Camelot on a journey, with the plan of entering a fake "knight" into Camelot's jousting tournament and then taking his place in the final, so as to win by Arthur's own skill and not just because he was a prince. However, Myror deduced that Arthur had returned to Camelot, and soon tracked him to Gwen's house, where Arthur was staying. He was about to shoot Arthur but was interrupted when an armed guard passed by, looking for the assassin who had been sent after Arthur.

When Myror discovered that Arthur had secretly entered the tournament, he killed Arthur's opponent and went to battle Arthur by himself. He injured Arthur with a blade hidden inside Myror's lance but Arthur returned to the field so as not to forfeit the tournament. Merlin found the body of the dead knight and worked out that it was Myror whom Arthur was fighting. Myror pulled out the blade again so Merlin used magic to cut a strap on his armour/saddle, distracting him so that Arthur could win, killing him. Arthur chose to let the fake "knight," who had secured Arthur's place in the final, take the glory. Continuing with his story that he had left Camelot before the tournament, he pretended to have killed Myror during an ambush on the way back.