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 (and former bullies) from school.