Whilethehotroddersandmotorcyclistsarehavingarock-and-rollbeachparty,abarrelofradioactivematerialisunloadedfromapassingship,plungestothebottomandsplitsagainstajaggedrock.Ablackliquidoozesoutandcoversashapelessmassontheoceanfloor,whichsuddenlymovesandbecomesanencrustedviciousmonster.Soonthereareseveralmonstersandtheymusthavehumanbloodtosurvive.Tinaisthefirstvictim,andfootballheroHankGreenandairheadElaineGavinenlisttheaidofherscience-professorfather,Dr.Gavin,tosolveandcapturethekiller.Notworkingfastenoughtopreventtheattackontwentyteen-agersataslumberpartynorthekillingofthreegirlmotorists,Dr.Gavinfindsanarmlostbyoneofthemonstersanddiscoversthatonlysodiumwilldestroythemonsterswhosecompositionismostlywater.CantheygatherenoughsaltinsouthernCaliforniatoputanendtothishorror
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