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Jacob (background) and his unknown adversary (foreground) in the past

Following the events of Follow The Leader, Kate, Sawyer and Juliet are imprisoned on the DHARMA submarine, being transported to the mainland. After informing Sawyer and Juliet of Jack's plan to neutralize the island's electromagnetic energy source with a hydrogen bomb, Kate pleas for their assistance in returning to the island. Juliet agrees with Kate's assessment, and persuades Sawyer to come with them. The two overpower a DHARMA attendant, and coerce the captain of the vessel to surface and allow them to escape in a lifeboat. After retrieving the plutonium core of the bomb, Jack and Sayid, with the assistance of Richard Alpert and Eloise Hawking, locate an entrance to the DHARMA barracks, and attempt to infiltrate the grounds in order to reach the Swan Station site to detonate the bomb. In the process, however, Sayid is shot by Roger Linus, and the two make a narrow escape with the help of Hurley, Jin and Miles in a DHARMA van. En route to the station site, the group are confronted by Kate, Sawyer and Juliet. After a private conversation turns to blows between Jack and Sawyer, Juliet intervenes and tells Sawyer that she has changed her mind, and decides to support Jack's idea. With renewed support, Jack and the survivors head to the Swan site to complete their goal...

In present day, John Locke, along with Sun, Ben, Richard and the rest of the Others, heads to the location of Jacob. Locke, perplexed by the idea that Ben has kept his plan of murdering Jacob a secret from Richard and the Others, confronts the former Other leader about it. Ben admits that, despite any misgivings he may have, he will support Locke no matter what. After arriving at the four-toed statue, which Richard claims to be Jacob's home, Locke takes Ben inside the structure to follow through with his plan. Following this, the group outside is confronted by the remaining survivors of Ajira Flight 316, who present a metal case containing what appears to be John Locke's deceased body, despite the obvious fact that Locke had appeared to enter the statue moments earlier... - Jacob-Centric