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简介：TheTARDISarrivesonanapparentlydesertedanddeactivatedspacestationNerva,otherwiseknownastheArk,orbitingEarthinthefarfuture.TheretheDoctor,SarahandHarrydiscoverthelastsurvivorsofthehumanraceheldinsuspendedanimation,Earthhavingbeenevacuatedthousandsofyearsearlierwhensolarflaresthreatenedtodestroyalllife. ThestationhasbeenvisitedbyaWirrn,aninsectlifeform,whichhaslaiditseggsinthesolarstacksandabsorbedthebodyandmindofoneofthesleepinghumans.TheDoctor'sreactivationofthestation'ssystemscausesthehumanstostarttorevive.Theirleader,nicknamedNoah,becomesinfectedbyoneoftheemerginglarvaeandisslowlytakenover. TheDoctorandhisfriendsmeanwhilegainthetrustoftheotherhumans,nowledbyamed-technamedVira.TogethertheymanagetolurethehatchedWirrninsectsintoashuttlecraftandthenejectitintospace. Inafinalactofhumanity,Noah-bythistimefullytransformedintoaWirrn-deliberatelyneglectstosettheshuttle'sstabilisers,causingittoexplode.…