Triple bill of sci-fi action horrors. In 'Deep Blue Sea' (1999), off the coast of Mexico, Dr Susan McAlester (Saffron Burrows)'s team of scientists are working on a cure for Alzheimer's disease by injecting degenerate human brain cells into mako sharks. The three sharks selected grow to over 40 feet in length, and begin to demonstrate signs of intelligent behaviour. When pharmaceutical company executive Russell Franklin (Samuel L. Jackson) arrives with funding in mind, one of the sharks attacks scientist Jim Whitlock (Stellan Skarsgard), biting off his arm. However, the helicopter taking Whitlock to surgery crashes into the research centre and disables the protective security systems which keep the killer sharks at bay... In 'Deep Blue Sea 2' (2018) shark conservationist Dr Misty Calhoun (Danielle Savre) is invited to see the work of billionaire Carl Durant (Michael Beach) and is horrified to learn he has been genetically altering bull sharks to enhance their learning capabilities. It's not long before the sharks begin to fight back against their captors, causing havoc and flooding the research facility. Will anyone make it out alive? Finally, in 'Deep Blue Sea 3' (2020) marine biologist Dr Emma Collins (Tania Raymonde) and her team are spending the summer in the abandoned fishing village of Little Happy in the Mozambique Channel, studying the effects of climate change on the great white sharks which return every year to the island. When six people disappear, the team discover a new breed of highly aggressive sharks are responsible for the attacks, and find themselves in a desperate fight for survival.