4026. Dr. Jack Shephard

Dr. Jack Shephard is a fictional character and protagonist of the ABC television series Lost played by Matthew Fox. Lost follows the journey of the survivors of Oceanic Airlines flight 815 on a mysterious island and their attempts to survive and escape, slowly uncovering more of the much broader island history they are a part of. The character was originally conceived by creator J. J. Abrams, though the direction of storylines owes more to co-creator Damon Lindelof and fellow showrunner Carlton Cuse. Actor Matthew Fox would have some influence on the character along the way; for example, Fox's own tattoos were incorporated into the character's backstory. Although at an early stage in the show's development, the character was originally intended to die in the pilot, the writers soon changed track and Jack became the show's main character from its pilot episode onwards.
The de facto leader of the crash survivors, in the show's first four seasons Jack is very much a man of science; he serves as the antithesis of man of faith John Locke (Terry O'Quinn). However, his experiences in season five mould Jack into a believer, to the point of becoming John Locke's spiritual successor in the final season. His leadership role culminates in him taking briefly over as protector of the island from its immortal guardian, Jacob (Mark Pellegrino) and being the one to engage one of the series' villains, the Man in Black (O'Quinn) in a climactic battle to the death. Jack's storylines have incorporated love interests: fellow survivor Kate Austen (Evangeline Lilly) and Juliet Burke (Elizabeth Mitchell), one of the mysterious Others who are the series' visible antagonists for the majority of its run. Other key relationships in the show involve Claire Littleton (Emilie de Ravin), whom he discovers is his half-sister; Hugo "Hurley" Reyes (Jorge Garcia) as his right-hand man; and Sawyer (Josh Holloway), his rival for leadership of the survivors and for the affections of Kate, even when at some points, Sawyer calls him the nearest thing he has as a friend.