Benjamin Linus, more commonly known as Ben, was a long-time resident of the Island and a former leader of the Others. His mother, Emily, died giving birth to him. At the age of eight Ben came to the Island with his father Roger, who was assigned the job of “workman” or janitor for the DHARMA Initiative. After being educated on the Island, Ben became enchanted with the Hostiles after a chance encounter with Richard in the jungle. At the age of twelve, Ben attempted to join them, but was shot by a time-traveling Sayid, who had hoped to kill him and thus, change the future. This event led to Ben being healed in the Temple, having been taken there by Richard Alpert, at which point his “innocence” was taken from him. Richard mentioned, Ben won’t remember anything, as such it was unclear if he remembered Sayid having met him in the future. Years later he became a workman for the Dharma Initiative, while actually being allied with the Hostiles and their leader Charles Widmore. At some point after the destruction of the Initiative on the Island in the Purge, Ben engineered the ousting of Charles Widmore and became the new leader of the Others. Years later he developed a tumor on his spine and worried what this meant since people were usually free of diseases on the Island.
In 2004, after Oceanic Flight 815 crashed on the Island, the survivors came face-to-face with Ben and the Others on many occasions. He was captured and held prisoner by the survivors for six days under the alias Henry Gale. His story proved to be false but he was freed by Michael, who had made a deal with the Others. With Jack, Kate, and Sawyer being held prisoner, he persuaded Jack to remove his tumor. Ben also met face-to-face with John Locke, manipulating him and later being threatened by him when Locke claimed to have heard Jacob, leading him to try and kill Locke. Ben later tried to stop the survivors from contacting a nearby freighter for rescue, knowing the people on the boat were sent by Charles Widmore to capture him and, he claimed, kill everyone else. He ordered the Others to the Temple for safety, but failed in his attempt to stop Jack from calling the boat and became a captive of John Locke’s group on the Island. After the mercenaries from the freighter attacked the Barracks and killed his daughter, Ben and Locke went to Jacob’s cabin, where they were told how to protect the Island. Ben went to the Orchid station and moved the Island, sacrificing his presence there and his leadership over the Others, leaving Locke as his successor.
Ben was transported to the Sahara desert ten months into the future, and soon discovered that several of the crash survivors had also left the Island. He enlisted the help of Sayid in his war against Widmore, and vowed to kill Widmore’s daughter, Penelope, in revenge for the death of his own, but ultimately failed. Discovering that Locke was off the Island, Ben killed him and used his body, and the Oceanic Six, to return to the Island aboard Ajira Flight 316. Once back on the Island, he was judged by the Monster for the death of Alex and was then used by the Man in Black, who was posing as a resurrected John Locke, to kill Jacob. After stabbing Jacob, Ben was touched by Jacob. Later, he joined Ilana’s group when they traveled to the Temple (burying John Locke on their way). Miles read the ashes of Jacob and confirmed to Ilana that it was Ben who killed him. Ilana forced Ben to dig his own grave, but Ben apologized and was accepted into the group. After Ilana’s death, Ben went with Richard and Miles to the Barracks to find explosives to blow up the Ajira plane to stop the Man in Black from leaving the Island. Once he reached the Barracks, Ben discovered that Widmore had returned to the Island and was finally able to kill him after the Man in Black promised that he would have the Island all to himself. When Ben learned that the Man in Black was going to destroy the island, Ben sided with the survivors and was willing to go down with it. After Jack did his job relighting the Source, Hurley was the new protector and made Ben his advisor.
In the flash-sideways, Ben was the teacher of his previous ‘daughter’, Alex. As his acquaintances from the Island moved on, he chose to stay behind, feeling guilty for everything he had done to them on the island.