In this episode, the Doctor (Jodie Whittaker), Mandip Gill (Mandip Gill), and Dan (John Bishop) set foot in a 19th-century Chinese town that is threatened by the dreaded pirate queen Madame Ching (Crystal Yu) and a monster foreign power she inadvertently releases.Will the Doctor, Yaz, and Dan come out of this desperate fight against the Sea Devils and save the planet?