Relates the adventures of Sir Gawain, the only undefeated knight in King Arthur's court, who eventually learns the value of friendship, courtliness, and courtesy after a challenge from the Green Knight.

Sir Dinadan and his friend Sir Palomides, Sir Gaheris, Sir Terence, and other knights of the Round Table and their associates try to stop Mordred and his White Horsemen from ending King Arthur's rule of Great Britain.

While not the most intrepid knight of the Round Table, Sir Givret the Short helps King Arthur and the other knights with his cunning and cleverness.