The Battle of Hastings will soon be fought on English soil. King Harold knows the Norman invasion is coming, but he must first head up north to fight the Vikings. Who will come to his aid? Still searching for their missing parents who are lost somewhere in the past, twins Jemima and Joe Lancelot travel back in time to the year 1066, together with best friend Charlie and Max, their talking Tonkinese cat. Many dangerous adventures await them during a hazardous journey across the country to help the king repel the invaders. Will they be able to change the course of history, or will Harold fail to heed their advice?