Series 2, Episode 1
Continuing on from where the first season ended; the hatch door has been blown off and Locke is determined to go inside it, despite the protests of Jack, who then returns to the beach to advise the survivors they will be safe. The flashbacks are of Jack's attempts to save an injured woman's (Sarah - his future wife) back from paralyzing her forever. Back at the hatch, Kate is eager to help Locke discover what is down there and becomes the first to descend into its darkness. Meanwhile Shannon loses the dog and upon searching for it in the darkness of the jungle she is sure she has just seen something very disturbing indeed....
Note: many of the cast billed in the opening credits do not actually appear in this episode.