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After a powerful storm damages their Maine home, David Drayton (Thomas Jane) and his young son head into town to gather food and supplies. Soon afterward, a thick fog rolls in and engulfs the town, trapping the Draytons and others in the grocery store. Terror mounts as deadly creatures reveal themselves outside, but that may be nothing compared to the threat within, where a zealot (Marcia Gay Harden) calls for a sacrifice. Wikipedia