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Season 1 - Sep. 25, 2006
Season 2 - Sep. 24, 2007
Season 3 - Sep. 22, 2008
Season 4 - Sep. 21, 2009

Heroes Season 4 Episode 18
HD
Overview:
“The Wall” is the seventeenth episode of the fourth season of the NBC science fiction drama series Heroes, and the seventy-sixth episode overall. The episode aired on February 1, 2010.