Dev Patel, Alicia Vikander, and Joel Edgerton star in the A24 film The Green Knight. It tells the story of Sir Gawain — King Arthur’s reckless nephew — who goes on a quest to confront the Green Knight, a tester of men. Gawain then fights ghosts, giants, thieves, and schemers in a journey to define his character and prove his worth in his family and his kingdom.