Sir Lancelot is challenged by the other knights before he can become a member of King Arthur's Knights of the Round Table. He has to prove his worth and is put through a series of rigorous tests.

Sir Lancelot goes to the rescue of Urgan the Strong, whose castle is besieged by Sir Melius the Mighty and his two sons. Sir Lancelot drives off the invaders, and Urgan offers his daughter Igrane in marriage to the knight as a reward for his bravery.

Queen Guinevere is kidnapped by King Arthur's cousin, Sir Mordred. He and his father, King Pell, demand King Arthur's kingdom in exchange for the queen's life.