Len Cordova

Claire has overdone it in Halloweens past and the neighbors definitely don't share her enthusiasm, so this year she's being forced to tone it down and keep it "kid-friendly," and Phil has an idea to hold an open house on Halloween night. Meanwhile, Mitch and Cam host a costume party while contending with Lily wondering who her real mom is, and Gloria's pregnancy hormones are on overdrive, making her even more hotheaded than usual.

When the victim's father is ruled out as a suspect in a kidnapping case, the unit investigates the seemingly safe neighbourhood in which the child lives for clues as to who is responsible for the young girl's abduction.

Aiden and Emily discover long-buried family secrets, and Victoria pays Mason Treadwell a surprise visit as she gets closer to exposing Emily.

After discovering something odd just offshore, Jack and Sayid come up with a plan to confront `The Others' and hopefully get Walt back. At the same time there will be an answer to the question of where Michael has been. Meanwhile, Eko and Locke come to blows as Locke makes a potentially cataclysmic decision regarding the button and the hatch.