Snakehead Terror

Two years before the main events, authorities poison Cultus Lake in an effort to wipe out the snakehead threat. It initially appears successful and daily life around the lake resumes. The poisoning sets the stage for a delayed, deadly resurgence beneath the surface.

Two years after the poisoning, bodies begin surfacing from the lake. Sheriff Patrick James orders the water temporarily closed as officials worry about what's lurking beneath. The quiet town becomes tense as rumors spread about the danger beneath the surface.

Unseen predators claim Patrick's daughter and take the lives of Amber's boyfriend James and his friend. The community reels from the sudden, violent deaths and questions what kind of threat lurks in the lake. Investigators search for a rational explanation as fear grows.

Local doctor Doc Jenkins presents a tooth found among the bodies to Sheriff James. The clue hints that the problem is more than a simple fish outbreak and points to a human-linked cause. The discovery deepens the mystery and pushes the investigation toward a nightmarish possibility.

Patrick tries to convince the town's mayor to shutter the lake for good, citing public safety and the risk to residents. He encounters strong opposition from leaders who fear the economic impact on tourism, fishing, and bait shops. The debate stalls decisive action and keeps the threat simmering beneath the surface.

Marine biologist Lori Dale arrives to assist Patrick in unraveling the mystery. She quickly identifies the threat as unusually large snakeheads and suggests something in the lake is triggering abnormal growth. Lori's expertise becomes a key turning point in the investigation.

Lori theorizes that the snakeheads have been dosed with human growth hormones to make them bigger and more dangerous. She warns that a hidden source in the lake's ecosystem could be responsible. The possibility of human involvement drastically changes the scope of the threat.

A fisherman captures a grotesquely enlarged snakehead, reinforcing the idea that the danger is real. The catch seems to prove growth is occurring, but some officials still doubt the threat is widespread. Lori and Patrick suspect the problem is more extensive and systemic.

Patrick and Lori set out on the lake to locate the source of the hormones. They map the lake, test sites, and potential contamination points as they surveil submerged areas. The mission underscores the scale of the conspiracy behind the fish's abnormal growth.

Amber rallies her friends—Jagger, Luke, and Craig—to kill the snakeheads in vengeance for the deaths they caused. They commandeer a boat and embark on a reckless mission into the lake's danger. The plan shifts from passive fear to active, perilous resistance.

The snakeheads attack the group on Craig's boat, decimating the crew and throwing chaos over the water. Luke is knocked overboard, and Jagger accidentally destroys the other boat's gas tank, causing an explosion. Amber and Jagger are forced to crash and become stranded on a remote island with Luke alive but badly injured.

On the island, Amber, Jagger, and Luke stumble upon a cabin containing a half-devoured man. Luke pushes further and is attacked by a snakehead, wounding his leg. Amber fights back and kills the creature with an axe, while the others scramble to survive.

On land, Patrick and Deputy Reece breach Doc Jenkins' laboratory and uncover a receipt for a large shipment of human growth hormone. They arrest Jenkins, who confesses to using the hormones to boost the lake’s fish population for Colin’s bait shop after the poisoning. The confession reveals a deliberate human-driven manipulation behind the catastrophe.

The quartet formulates a plan to fry the snakeheads using the lake’s current. Lori arrives with an electric stun device, and together they coordinate a sequence to cut power and flood the water with electricity. Patrick knocks the power cable loose, and Lori drops it into the water, electrocuting the last of the snakeheads. The survivors—Patrick, Lori, Amber, and Jagger—embrace as the fried snakehead bodies burn away.