High Quality Content by WIKIPEDIA articles! Jacob is a fictional character of the ABC television series Lost played by Mark Pellegrino. He is seen as the mysterious and ageless protector of The Island. He was first mentioned as the true leader of The Others by Ben Linus and was described as a "great man" that was also "brilliant", "powerful", and "unforgiving". He made his first appearance in the Season 5 finale "The Incident". He was also killed in this episode, but continued to appear as a ghost as well as in flashbacks in the episodes Ab Aeterno and Across the Sea. He is perhaps the most central character of the entire series, as almost all the events that take place starting from the plane crash right to the end revolve around him and his nemesis The Man In Black. In some of his appearances, Jacob has exhibited supernatural powers such as healing, near omniscience, conferring immortality, and changing peoples` destiny to suit his goals. Through these powers, he had a heavy influence on the lives of several of the main characters including Jack Shephard, Kate Austen, John Locke, James Sawyer, and Hugo Reyes.