Arthur is the infant son of King Uther Pendragon and Queen Igraine of Camelot. During King Lavik's malevolent assault on Camelot, the wizard Merlin spirits Arthur to safety, entrusting the prince to a loyal knight. This knight raises Arthur as his own son, guarding the secret of his royal heritage throughout his childhood.

At fifteen, Arthur encounters the sword Excalibur embedded in a stone during a royal tournament. Unaware of its legend, he effortlessly draws the blade, fulfilling the prophecy that only Britain's rightful king could wield it. This act reveals his lineage, compelling his foster father to disclose the truth of his parentage and birthright.

Following his coronation, Arthur assumes leadership of Camelot and dedicates himself to liberating Britain from Lavik's tyranny. He faces opposition from the witch Medessa, who wields dark magic against him and his allies. Arthur displays strategic acumen by uniting loyal subjects, including knights like Lancelot and Tristan, to form the Knights of the Round Table. This fellowship becomes central to his campaign against Lavik's forces.

Arthur embodies righteousness, courage, and a commitment to justice. He actively leads battles and quests, notably the pivotal mission to secure the Holy Shield – an artifact essential for defeating Lavik and unifying the kingdom. His leadership inspires unwavering loyalty, and his actions consistently prioritize protecting the innocent and restoring peace to Britain.

The narrative traces Arthur's evolution from an unwitting heir to a proactive monarch confronting supernatural and military threats. While incorporating traditional Arthurian figures and relics like Excalibur and Camelot, the series introduces original characters and narratives, resulting in a distinct interpretation that diverges from established legends.