 Cat, Krissie, Marcos and Tommy are marooned on an island when their boat floats free from it s anchorage. While Mike and Ashley search for them when they fail to report back to work, the foursome s situation becomes desperate when Krissie is bitten by a poisonous spider and a crazed ex-Vietnam soldier hiding on the island thinks Tommy is the man responsible for the loss of the old soldier s platoon twenty-five years earlier.