An American research party on Scotland's Loch Ness believes it has sonar evidence that the fabled monster of the lake is active. They summon Case Howell (
Brian Wimmer), a veteran adventurer, to help them capture the creature for further study. Meanwhile, a go-getting TV producer (
Lysette Anthony) arrives to make a documentary about the news (and instantly gets a crush on Case). But the locals stir the beast, which suddenly becomes carnivorous, and the lake's Coast Guard official (
Vernon Wells) refuses to keep people off the shoreline and boats off the water. As the body count begins to require a calculator, Case and his scientists become desperate to stop the thing, enlisting the help of Captain Blay (
Patrick Bergin), an eccentric hermit who has motive for slaying the critter -- it killed his son 17 years earlier, but Blay was blamed in the tragedy. ~ Buzz McClain, All Movie Guide