Born in Antarctica, Dinoshark noses his way down the warmer currents to Mexico, towards a popular vacation spot crowded with party-goers unwittingly ready to fall prey to a prehistoric eating machine. When the killings begin, it becomes clear that no normal animal can be responsible for such savagery.
Local captain Trace McGraw and marine biologist Carol seem to be the only ones convinced that the creature terrorizing their shores is something other than the expected man-eating shark. They enlist the help of the world's only expert on the Dinoshark. Together, will they be able to reel Dinoshark in?