After his long sojourn in the Mediterranean, Prince Valiant is back in Britain, where he takes on a new, intricate mission on behalf of King Arthur. Here, Valiant finds himself in the middle of a conflict between Saxon settlers and violent Viking raiders. Gawain's return journey to Camelot is fraught with misadventure as he is beset by jealous romantic rivals, a marriage-minded widow and a thieving sorcerer. Young Galan goes on a hunt to capture the fabled unicorn, and Arn, after losing his horse in a Welsh bog, is enslaved and held for ransom.