▁ho led ▁up ▁in . ▁The ▁Z ygon ▁spl inter ▁group , ▁appearing ▁as ▁the ▁soldiers ' ▁relatives ▁and ▁friends , ▁k ills ▁the ▁soldiers ▁and ▁fle es ▁back ▁to ▁the ▁UK ▁through ▁under ground ▁t unn els . ▁The ▁Doctor ▁finds ▁Os good ▁safe ▁under ▁the ▁church . ▁The ▁Doctor ▁and ▁Os good ▁bring ▁a ▁Z ygon , ▁injured ▁from ▁a ▁bomb ing ▁run , ▁ab o ard ▁their ▁flight ▁back ▁to ▁the ▁UK . ▁The ▁Z ygon ▁tells ▁the ▁Doctor ▁that ▁their ▁invasion ▁has ▁already ▁taken ▁place . ▁ ▁In ▁New ▁Mexico , ▁UN IT ▁leader ▁Kate ▁Stewart ▁finds ▁Tr uth ▁or ▁Con sequ ences ▁un in hab ited ▁aside ▁from ▁the ▁sh er iff , ▁Nor land er . ▁The ▁sh er iff ▁reve als ▁herself ▁as ▁a ▁Z ygon , ▁and ▁prepar es ▁to ▁kill ▁Kate . ▁In ▁London , ▁Bon nie ▁tr icks ▁UN IT ▁scient ist ▁Jac ▁into ▁going ▁to ▁Clara ' s ▁block ▁with ▁UN IT ▁troops , ▁where ▁a ▁lift ▁takes ▁them ▁to ▁a ▁series ▁of ▁under ground ▁t unn els , ▁which ▁lif ts ▁across ▁the ▁city ▁are ▁connected ▁to . ▁When ▁one ▁pod ▁is ▁revealed ▁to ▁contain ▁Clara , ▁Jac ▁real ises ▁that ▁Clara ▁was ▁switched ▁with ▁a ▁Z ygon . ▁Jac ▁and ▁the ▁troops ▁are ▁killed ▁by ▁the ▁spl inter ▁group ▁when ▁they ▁attempt ▁to ▁escape . ▁Bon nie ▁travel s ▁to ▁UN IT ▁to ▁obtain ▁a ▁shoulder - f ired ▁miss ile . ▁She ▁goes ▁to ▁the ▁coast ▁and ▁contacts ▁the