Merlin will cast its final spell on BBC One this Christmas. The fantasy-adventure show that’s loosely based on Arthurian legend, airs on Syfy in the U.S. and is to end after five seasons. Co-creators and exec producers Johnny Capps and Julian Murphy say the series is bowing out at its natural climax, with the finale bringing an end to the battle for Camelot. Capps and Murphy have also announced they are leaving Shine TV, producer of the show, at the end of the year to start their own production company. Shine and FremantleMedia Enterprises, which handles the show internationally, are in the early stages of developing potential Merlin spinoffs using the universe created in the series. Any future shows would be produced by Shine’s Kudos in partnership with FME. Merlin debuted in 2008 and stars Colin Morgan, Bradley James, Katie McGrath, Angel Coulby, Richard Wilson and the voice of John Hurt. Its other international broadcast partners include Germany’s Super RTL, France’s Canal+ and Australlia’s Network Ten.