Frankenfish

John Crankton is killed by an unseen predator in the bayou, leaving the community shaken. The attack hints at a dangerous force lurking in the waters.

Sam Rivers, a medical examiner, and Mary Callahan set out into the marsh to uncover what happened. Sam is at ease in his surroundings, while Mary senses danger around every bend.

They encounter Elmer, who is noodling for catfish in the swamp canals. With Elmer’s help, they push upriver toward a fishing community.

In the fishing community they meet Gloria Crankton and Eliza Crankton, and learn that a strange boat washed up upriver three months earlier. Gloria explains that odd things have begun since then.

Sam and Mary discover a large fishing boat along the canal and explore its interior. They find the crew’s remains in the hold; in a panic, Mary knocks Elmer from the boat and something drags him under.

The pair flee in the boat, unaware that they have triggered a homing signal on the ship. The signal draws attention from the shore and raises the stakes for everyone involved.

On the mainland, a team relays the incident to Jeff, a wealthy bounty hunter. The report signals trouble ahead as the strange boat remains a threat.

That night, Roland on the roof is decapitated by a lurking frankenfish. His wife Bobbi tries to escape on a boat but is killed when the creature attacks.

At a nearby stilt house, Ricardo baits a large hook with an entire catfish. A huge predator bites his legs; he shoots it, but a second frankenfish surges from the water and devours him.

Mary's plan remains unrevealed, and she dies in an accidental gunfire incident caused by an explosion that propels a propane tank into the boathouse. Eliza is sent into the water, and Sam dives in to rescue her. In the mayhem, a frankenfish leaps out and tears off Gloria’s legs.

Jeff and his team arrive and the fish turn their attacks toward them, knocking the hunters from their fanboats. Most of Jeff’s crew are slaughtered as Sam, Eliza, and Dan join the pursuit.

The trio follows a bloody trail back to the fish’s den, where the monstrous predator is found dead—at least for the moment. Jeff forces Sam at gunpoint to enter first; Sam flees as a third, larger frankenfish kills two hunters, including Jeff.

Dan, Sam, and Eliza hurry to escape on the fan boat, but Dan falls into the mud and is left behind. Dozens of baby frankenfish emerge from the water, closing in on him.

Sam and Eliza share a kiss and turn back toward safety, hoping to rescue Dan as the waters remain full of deadly, engineered predators. The future remains uncertain as more threats lurk below.