Jacob

Jacob (Iacob in Latin) is a fictional character of the ABC television series Lost played by Mark Pellegrino. 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 final episode of season five. Despite being killed in that episode, he continued to appear as a spirit, as well as in flashbacks in the episodes "Ab Aeterno" and "Across the Sea".