The story is based on the poem of Sir Gawain and the Green Knight. It is scheduled to be released on May 29, 2020, by A24.
A fantasy adventure based on the Arthurian legend, The Green Knight tells the story of Sir Gawain (Dev Patel), King Arthur's reckless and headstrong nephew, who embarks on a quest to confront the eponymous Green Knight, a gigantic green-skinned stranger.
Initial release: 29 May 2020
http://www.beentothemovies.com/2020/02/the-green-knight-official-teaser-trailer.html
