Overview: Unable to communicate with the outside world, the Unit and their families must survive when a deadly gas poisons anyone in their community who steps outside.
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First Air Date: Mar 07, 2006Last Air date: May 10, 2009Season: 4 SeasonEpisode: 69 EpisodeRuntime: 42 minutesQuality: HDIMDb: 7.28 / 10 by 181 usersPopularity: 76.858Language: English