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Samuel learns just how powerful he can become and takes dangerous measures to reach his full potential. Meanwhile, as Tracy begins to lose control of her ability, one of her own comes in harms way. Elsewhere, Sylar continues his battle with Matt.
First Air Date : Sep 25, 2006
Last Air date : Feb 08, 2010
Episode : 78 Episode
Season : 4 Season
Runtime: 43:14 minutes
Studio: NBC
Country: United States of America