Episode 4 of American Horror Story starts their 2-part Halloween Special. To get you ready for tonight's episode, we have the episode synopsis and two preview clips.

“American Horror Story revolves around the Harmons, a family of three who moved from Boston to Los Angeles as a means to reconcile past anguish. The all-star cast features Dylan McDermott as ‘Ben Harmon,’ a psychiatrist; Connie Britton as ‘Vivien Harmon,’ Ben’s wife; Taissa Farmiga as ‘Violet,’ the Harmon’s teenage daughter; Jessica Lange in her first-ever regular series TV role as ‘Constance,’ the Harmon’s neighbor; Evan Peters plays ‘Tate Langdon,’ one of Ben’s patients; and Denis O’Hare as ‘Larry Harvey.’ Guest stars for the series include Frances Conroy as the Harmon’s housekeeper; Alexandra Breckenridge as the Harmon’s housekeeper; and Jamie Brewer as Constance’s daughter.”

Episode 1.04 "Halloween, Part 1"- The line between the living and the dead blurs on Halloween. Two of the house’s previous residents give the Harmons decorating advice. Written by James Wong, directed by David Semel.

While "Halloween, Part 2" was originally planned to air on Halloween night, it has been moved to its usual Wednesday slot, and a marathon of the first 4 episodes will take its place.