Tunnel Vision (S04E01)

King John plans to dig a tunnel to Scunthorpe, but the townspeople are alarmed by rumors that its residents possess two heads. Meanwhile, Rose and Guy devise a scheme to make money by faking a ransom, claiming that Marian has abducted Guy, who retreats to the forest. To execute their ruse, Marian and Rose find themselves tied together and subjected to mud-throwing by the villagers, who mistakenly believe they are confronting the feared two-headed creature from Scunthorpe.