The Kid Who Would Be King is a 2019 fantasy action-adventure film written and directed by Joe Cornish. A British/American venture, the film stars Louis Ashbourne Serkis, Tom Taylor, Dean Chaumoo, Rhianna Doris, Angus Imrie, Rebecca Ferguson, and Patrick Stewart. The plot follows a young boy who finds King Arthur's legendary sword Excalibur and must use it to stop an ancient enchantress from enslaving the world with help from his classmates from school.