S1E5 · White Rabbit

Complete story — includes the ending

Jack's mother guilts him into retrieving his estranged father Christian from Australia. He goes and finds that Christian drank himself to death, loading his coffin onto the flight. In the present, Jack rescues Boone Carlyle from drowning, though a woman Boone was trying to save dies. Jack sees Christian walking through the jungle and encounters Locke while chasing him, who affirms his belief in the island's power and advises Jack to keep looking. He follows Christian to his coffin, which he finds empty. The survivors' water goes missing until Boone is caught with it, wanting to ration it himself and become a leader. Jack stops him from being beaten, insisting that "if we can't live together, we're going to die alone."