This episode finds the Doctor (Jodie Whittaker)\, Yaz (Mandip Gill) and Dan (John Bishop) in 19th century China\, where a small coastal village is under threat – from both the fearsome pirate queen Madame Ching (Crystal Yu) and a monstrous alien force which she unwittingly unleashes.　　Will the Doctor\, Yaz and Dan emerge from this swashbuckling battle with the Sea Devils to save the planet