Themonster,whichlookslikeanastierversionof"TheCreaturefromtheBlackLagoon,"invadesasleepylighthousetown.Thesuperstitiouslighthousekeeperisworriedforthesafetyofhisbeautifulteenagedaughter,soheleavesfoodforthemonster,whodwellsinanearbycave.Whenbodieswashupashore,thelocalstakenotice.