AllMovie

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.