A balding man paralyzed from the waist down, Locke regains the use of his legs after the plane crash and lives out his fantasy as a hunter on the island. His becomes a believer of the island and does whatever he can to protect it.
John Locke is the son of Emily Locke and Anthony Cooper, a ruthless conman who is also responsible for defrauding Sawyer's family. His mother gave birth to him and refused to be a mother at her age. Emily's mother takes a look at John while Richard Alpert, ageless, gives a friendly smile behind the glass. Richard later visits Locke when John was 5 and asked him that he could take him to a school for the very special. Richard placed items down on the table and John picked up the knife. Ricahrd left abrupty saying Locke is not ready. Richard tries to bring Locke to the island with a science camp in Portland, Oregon as a front. Locke says he is not a man of science and leaves.
John grew up never knowing Cooper and only met him after hiring a private investigator to track his biological father down. Cooper warmly welcomed Locke into his life, but this turned out only to be a ruse for Locke's father to take John's kidney. After confronting his father about a particularly malicious con he is running on elder woman to take her money, Cooper pushes John out of a forty story apartment resulting in a broken spine. John becomes a broken man after. After rehabilitation Locke tries to go on walkabout in Australia, but is refused because of his paraplegic state and has to board Oceanic 815 to return home.
After the crash Locke wakes up on the beach to find his legs miraculously working again and quickly puts them to good use fulfilling his dream of being a hunter. His uncanny knowledge of survival techniques helps the fuselage survivors to prosper. While on a hunting expedition he encounters the monster and smiles. Later he would say that he saw the island, and what he was was beautiful. He later cringed in fear when the monster threatened the opening of the hatch. It's while on an outing with Boone that the pair discover the hatch and plot to open it. Locke becomes obsessed with the button inside the hatch believing it was his purpose to do so for he was saving the world. His visit to the Pearl Station reveals the button to be only a test at which point he becomes depressed. He with Desmond storm to prevent the button from being use. Desmond changes his minds, uses a fail safe key to make the electromagnetic chaos stop. His relationship with Ben, the Others and his fellow fuselage survivors is complicated and goes back and forth between painting him as a villain and hero.