A scientific expedition to Loch Ness runs into trouble when the group leader is killed in a mysterious diving accident. Soon after, when the unorthodox Professor Howell shows up to take over as leader of the group, more strange incidents and attacks start to occur. While Howell and TV producer Elizabeth Borden (who has been financing the team's work in exchange for exclusive footage of their discoveries) are busy investigating the source of the attacks, the body of an enormous sea creature washes up on the lake's shore. Obviously, this is the famed Loch Ness Monster, right? Perhaps not...