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!

每周，我们都会看到汉娜和丹这对世界上最糟糕的兄妹，因为自己的自私和愚蠢，大肆破坏周围人的生活，包括老朋友、恋爱对象、家人，以及碰巧与他们擦肩而过的倒霉蛋。