WhenamysteriousanddangerouswhirlpoolphenomenonappearsinthetropicsoftheAtlanticOcean,BelkaandStrelka,thefirstastronautsontheirwaybackfromamissiontoSaturn,aresenttoinvestigate.Astheyventuredownintotheswirlingoceandepths,theydiscoveramysteriousUFOattemptingtostealallofEarth'swater.Withthehelpoftheirgoodfriends,BelkaandStrelkaonceagainperformaheroicmissiontosavebothourplanetandthedistanthomeoftheirnewalienfriends.