ThisepisodefindstheDoctor(JodieWhittaker),Yaz(MandipGill)andDan(JohnBishop)in19thcenturyChina,whereasmallcoastalvillageisunderthreat–fromboththefearsomepiratequeenMadameChing(CrystalYu)andamonstrousalienforcewhichsheunwittinglyunleashes.WilltheDoctor,YazandDanemergefromthisswashbucklingbattlewiththeSeaDevilstosavetheplanet?