2-Headed Shark Attack (2012)

A group of wakeboarders is attacked and devoured by a two-headed great white shark. Meanwhile, Sea King, a Semester at Sea-like ship led by Professor Franklin Babish and his wife Anne, hits a dead shark, which becomes lodged in the boat's propeller, damaging the hull and causing the boat to take on water. The two-headed shark then attacks the boat and breaks the radio antenna, preventing the ship co-captain Laura from summoning help. Babish and the students use a dinghy to take shelter on a nearby deserted atoll, while Anne remains on the Sea King with Laura and the ship's crew, Han and Dikilla. Laura is ripped in half by the two-headed shark.

Meanwhile, Babish and the students explore the atoll. Assembling in an abandoned fishing village, they search for scrap metal to repair the boat. Haley and Alison go swimming topless with Kirk, and are eaten by the two-headed shark. The rest of the group meet up and find two speedboats before an earthquake hits, causing Babish to injure his leg. Dana bandages Babish's leg, while Jeff and Mike accompany him back to the Sea King on the dinghy. En route, Jeff and Mike are eaten by the shark while attempting to swim to the Sea King.

The students find two boats on the island, which Kate and Paul fix. Cole finds a gasoline tank to fuel them, but steals one of the boats together with Ryan, Jamie and Alex. Kate, Paul and Dana follow in the other boat. They are all unaware of the shark, which attacks Cole's boat. Ryan falls into the water and is eaten, alerting the others to the shark's presence. Paul concludes that it is drawn to Cole's boat as it has a bigger engine. Cole bails, and the shark eats Jamie and Alex. When the survivors reach shore, Kate confronts Cole for abandoning Jamie and Alex. Minutes later, the Sea King is abandoned and the survivors meet on the island.

Another earthquake then hits. The group realizes that the earthquakes are actually the atoll collapsing in on itself. They hook up a generator to metal poles and place them in the water to distract the shark while Kate and Cole travel to the Sea King and repair the hull. The plan works until the shark attacks the poles, knocking Han and Dikilla into the water to their deaths. Kate fixes the ship, only for Cole to drive away without her, forcing her to swim back to the atoll. The two-headed shark attacks the Sea King, causing it to sink and send out a distress signal; Cole escapes on a lifeboat but his cellphone rings alerting the shark. The shark attacks and eats Cole. The atoll is sinking too, prompting everyone to flee for their lives.

Kristen and Dana get separated from the group and are devoured. Franklin and Anne also get separated from the group, and after running into a dead-end due to a tsunami approaching the atoll, they share one final kiss as the shark eats them. The rest of the group end up in the water as the tsunami strikes the island. The remaining students swim into the half-sunk village chapel to hide, but the shark breaks in. Lyndsey uses a gun to shoot it, but it eats her. Ethan uses a large wooden cross in the chapel to try attacking it, which also fails as it eats Liza and Michelle. Paul, Kate, and Kirsten climb out the window and escape while Ethan distracts the shark, only to get caught and eaten as well.

The final three discover a gasoline tank, and lure the shark towards it, but fail to ignite it. Kate attempts to stab the shark and is nearly eaten, but Kirsten sacrifices herself instead to blow up the shark. However, only one of the shark's heads get blown off. Kate and Paul find one of the boats and turn it on as a decoy, taking shelter on part of the remaining atoll still above water. The shark attacks the unmanned boat, biting the motor; it explodes, killing the shark. A helicopter arrives, summoned by the distress signal sent out from the sunken Sea King, saving Kate and Paul.