While。the。hot。rodders。and。motorcyclists。are。having。a。rock-and-roll。beach。party,。a。barrel。of。radioactive。material。is。unloaded。from。a。passing。ship,。plunges。to。the。bottom。and。splits。against。a。jagged。rock.。A。black。liquid。oozes。out。and。covers。a。shapeless。mass。on。the。ocean。floor,。which。suddenly。moves。and。becomes。an。encrusted。vicious。monster.。Soon。there。are。several。monsters。and。they。must。have。human。blood。to。survive.。Tina。is。the。first。victim,。and。football。hero。Hank。Green。and。airhead。Elaine。Gavin。enlist。the。aid。of。her。science-professor。father,。Dr.。Gavin,。to。solve。and。capture。the。killer.。Not。working。fast。enough。to。prevent。the。attack。on。twenty。teen-agers。at。a。slumber。party。nor。the。killing。of。three。girl。motorists,。Dr.。Gavin。finds。an。arm。lost。by。one。of。the。monsters。and。discovers。that。only。sodium。will。destroy。the。monsters。whose。composition。is。mostly。water.。Can。they。gather。enough。salt。in。southern。California。to。put。an。end。to。this。horror