The 48 survivors scavenge what they can from the wreckage of their plane; a frightful creature appears to live in the jungle; the survivors' pasts threaten their ability to survive as a group.
The castaways' spirits are temporarily raised with the discovery of a transceiver in the wreckage; the group discovers handcuffs, a gun and an animal that shouldn't be able to survive in a tropical climate.
Sydney learns that the agency is investigating Vaughn; Irina and a manuscript are the bait to trap Sloane.
Sydney confronts her mother, who reveals her true motivation; Will struggles to figure out who is behind the setup.
Sydney goes under cover to learn the location of a stolen NSA code-breaker; Vaughn fears that Weiss has been killed on a mission; Sydney and Jack argue over whether to tell Nadia the horrible truth about her mother.