At the feast of Pentecost, a golden light fills the hall of Camelot and the Holy Grail appears in a vision above the Round Table. The knights set out on the greatest quest of all, and among them rides young Sir Percival, pure of heart.

A young knight with the purest of hearts arrives at Camelot: Sir Galahad, son of Lancelot. Only he may sit in the Perilous Seat, and it falls to him, with Percival and Bors at his side, to complete the quest for the Holy Grail.