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!

这一季依然会由每集的独立故事组成，故事发生的位置总与9号有关，一座1978年的阿尔卑斯山小木屋、一间艺术馆与一家关门之后的餐馆成为第三季上演好戏的舞台。