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Nielsen Ratings/Season Three

Airdate	Episode click "show" for episode data	18—49 year-old rating	18—49 year-old share	18—49 year-old viewers (in millions)	Total viewers (in millions)	Fast Nationals rating	Fast Nationals share
09/22/08	Heroes: Countdown to the Premiere	2.6	7	3.43	6.00	3.8	6
09/22/08	The Second Coming / The Butterfly Effect	5.3	12	7.00	10.09	5.9	9
09/29/08	One of Us, One of Them	4.5	11	5.94	9.50	5.7	8
10/06/08	I Am Become Death	4.0	9	5.28	8.20	5.0	7
10/13/08	Angels and Monsters	4.3	10	5.68	8.80	5.2	8
10/20/08	Dying of the Light	3.9	9	5.15	8.50	5.1	7
10/27/08	Eris Quod Sum	3.9	9	5.15	8.20	4.9	7
11/10/08	Villains	3.6	8	4.75	7.80	4.7	7
11/17/08	It's Coming	3.6	8	4.75	7.60	4.6	7
11/24/08	The Eclipse, Part 1	3.7	8	4.88	7.50	4.6	7
12/01/08	The Eclipse, Part 2	3.6	9	4.75	8.00	4.9	7
12/08/08	Our Father	3.6	9	4.75	7.70	4.7	7
12/15/08	Dual	3.7	8	4.88	7.90	4.7	7
2/2/09	A Clear and Present Danger	4.0	9	5.28	8.50	5.2	8
2/9/09	Trust and Blood	3.6	8	4.75	7.90	4.9	7
2/16/09	Building 26	3.6	8	4.75	7.70	4.6	7
2/23/09	Cold Wars	3.4	9	4.49	7.10	4.4	7
3/2/09	Exposed	3.3	7	4.36	7.20	4.5	6
3/9/09	Shades of Gray	3.2	8	4.22	6.70	4.1	6
3/23/09	Cold Snap	2.9	7	3.83	6.50	4.0	6
3/30/09	Into Asylum	3.1	7	4.09	6.40	3.9	6
4/6/09	Turn and Face the Strange	2.6	6	3.43	6.10	3.8	6
4/13/09	1961	3.3	8	4.36	6.80	4.1	6
4/20/09	I Am Sylar	3.1	8	4.09	6.50	3.9	6
4/27/09	An Invisible Thread	3.0	7	3.96	6.50	4.0	6