The young Prince Arthur of Brittany, who is the rightful heir to the throne of England, has fallen into the clutches of his uncle, the evil Prince John. Prince John and the Sheriff devise a way to keep Robin and his band out of the way, while they put into action an ambush plan, involving phoney outlaws, that will lead to the deaths of prince Arthur and Lady Marian. Robin and his men set out to develop a plan to rescue the young boy.