The episode, unlike most Lost episodes, does not divide its time between two different time settings, but takes place entirely in the past, except for a brief scene at the end from the season one episode "House of the Rising Sun. '' It depicts the origins of the characters of Jacob (Mark Pellegrino) and his brother, The Man in Black (Titus Welliver), and how they came to be on the island. It also reveals the identities of the corpses discovered in the cave in "House of the Rising Sun. '' None of the series regulars appear in the episode, except in the flashback sequence, making it the only episode of the series in which this occurs.
who plays jacob as a kid in lost
Mark Pellegrino