故事以多个角色的视角展开，使得叙事更全面立体，避免了单一视角的局限性。OnherfinalcombatmissionacrosstheruggedmountainsofAfghanistan,RoyalAirForcefighterpilotLt.KateSinclair’sjetisshotdownoveroneofthemostdangerousrebelstrongholds.Wheninsurgentscomeafterheratthecrashsite,shefindsrefugeinalongsinceabandonedundergroundbunker.AftertrackingSinclairintothedepthsofthebunker,theinsurgentsaccidentallyawakenaman-madedeadlybiologicalweaponknownastheRavagers-halfhuman,halfalienandhungryforhumanflesh.Terrified,shewatchesthecreaturesripapartthemenpursuingher.SinclairbarelyescapesandispickedupbyaUSarmypatrolsenttofindher.MajorRoyFinch,commanderofthelocalUSarmyoutpost‘FortApache’,andhisragtagsquadofbravesoldiershaveadifficulttimebelievingmutantmonstershavebeenkepthiddeninthesemountains.Unawarethatshehasbeentrackedtotheirbase,dozensoftheviciouscreaturesarealreadyswarmingtowardsthem.