Horrible Histories returns for a special about King John and Magna Carta, starring Ben Miller. John annoys the Barons and agrees Magna Carta at Runnymede, after a banging rap battle. Meanwhile across the world we meet the formidable Genghis Khan in Mongolia, and catch up with the crafty Saladin during the Crusades. With of course, our host Rattus to guide the way!
When Bentham DeQuetteville falls to his death from a roof after seeing a headless horseman, his aristocratic family seem more concerned about their forthcoming Civil War re-enactment than the incident. As Barnaby and Jones try to find out the truth behind the ghostly figure, their investigation uncovers shocking secrets about the DeQuettevilles.