Amidstageneralmeltingoftheicecaps,aweatherstationintheHimalayasisdestroyedandGammaIcommanderRodJacksonandhispartner,FrankPulaskyaresenttoinvestigate.JoinedbyLisaNielson(lookingforherfiance)andSharu,theirSherpaguide,theyarecapturedbyaraceofhairyblue-bodiedgiantswhoseleaderexplainstheyaretheAytiaandhaveestablishedthisrelaystationonEarthtoaidintheirplantocreateavasticeplanesotheirracecanleavetheirdoomedsolarsystemandconquertheEarth.Escapingfromtheoutpost,Jacksonfindsoutthealiens'mainbaseisononeofJupiter'smoons,Callisto,andheandPulaskyaresentintospacetobattletheAytiabeforehumanlifeonEarthisdestroyed.
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