OnherfinalcombatmissionacrosstheruggedmountainsofAfghanistan,RoyalAirForcefighterpilotLt.KateSinclair’sjetisshotdownoveroneofthemostdangerousrebelstrongholds.Wheninsurgentscomeafterheratthecrashsite,shefindsrefugeinalongsinceabandonedundergroundbunker.AftertrackingSinclairintothedepthsofthebunker,theinsurgentsaccidentallyawakenaman-madedeadlybiologicalweaponknownastheRavagers-halfhuman,halfalienandhungryforhumanflesh.Terrified,shewatchesthecreaturesripapartthemenpursuingher.SinclairbarelyescapesandispickedupbyaUSarmypatrolsenttofindher.MajorRoyFinch,commanderofthelocalUSarmyoutpost‘FortApache’,andhisragtagsquadofbravesoldiershaveadifficulttimebelievingmutantmonstershavebeenkepthiddeninthesemountains.Unawarethatshehasbeentrackedtotheirbase,dozensoftheviciouscreaturesarealreadyswarmingtowardsthem.