Something has awoken. Roused from its slumber following an Antarctic ice quake, an immense beast has risen from the depths. Dwarfing even the mighty blue whale, the gargantuan wonder of evolution takes charge of the oceans, setting a catastrophic chain of events in motion. Henry Rainwater is a rookie crab fisherman trying to shake the family namesake and make his own way in life. After surviving an encounter with the beast which sees his father and the rest of the crew of their family boat killed, Rainwater becomes a recluse, deathly afraid of the creature which lurks in the ocean. The only man that believes Rainwater is Andrews, an ambitious scientist charged by the government to investigate the existence of the creature. Rainwater soon finds out that Andrews has different motivations for locating the beast. Driven to find his redemption and clear his name, Henry must overcome his terror and set out to sea in order to track down and kill the creature, in the hope of finding it before Andrews and his unhinged superior, Russo can put their own plan into action, one which could have terrible repercussions for the entire human race...