AstheFifteenthDoctor,playedbyNcutiGatwa,takesovertheTARDISforhisfirstepicadventurehewillbejoinedbyRubySunday,playedbyMillieGibson,asshemakesherdebutastheDoctor’scompanion.TheepisodeseestheDoctorcomeface-to-facewiththemythicalandmysteriousgoblinsashislifecollideswithRubySunday,playedbyMillieGibson.LittleisknownaboutRubySundayasshewasabandonedonChristmasEveasababy.Nowlivingwithhermum,Carlaandgrandmother,CherryherworldisabouttobeturnedupsidewhensheencounterstheDoctorandthetwosetoffontheirfirstadventuretogether
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