The Big Bang Theory was adjusted up two tenths with adults 18-49 to a Thursday high 5.1 rating. Grey's Anatomy and The Vampire Diaries were each adjusted up a tenth of an adults 18-49 ratings point vs. the preliminary ratings. Private Practice and Rules of Engagement were adjusted down by a tenth of a point.
Game 2 of the World Series scored a 4.0 adults 18-49 rating and 14.28 million viewers.
Sure, NBC was airing repeats, but as with the preliminary numbers, CW came out ahead of NBC for the night with adults 18-49.
Final national broadcast primetime ratings for Thursday, October 20, 2011:
| Time | Net | Show | 18-49 Rating/Sh | Viewers (Millions) |
| 8:00 | CBS | The Big Bang Theory | 5.1/16 | 14.93 |
| FOX | World Series Gm 2 Rangers at Cardinals 8-11:11p | 4.0/11 | 14.28 | |
| CW | Vampire Diaries | 1.4/4 | 3.03 | |
| ABC | Charlie's Angels | 1.2/4 | 5.57 | |
| NBC | Community (R) | 0.9/3 | 2.39 | |
| 8:30 | CBS | Rules of Engagement (Season Premiere) | 3.6/10 | 11.45 |
| NBC | Parks & Recreation (R) | 1.1/3 | 2.47 | |
| 9:00 | ABC | Grey's Anatomy | 3.6/9 | 9.54 |
| CBS | Person Of Interest | 2.7/7 | 12.42 | |
| NBC | The Office (R) | 1.5/4 | 3.28 | |
| CW | The Secret Circle | 0.9/2 | 2.12 | |
| 9:30 | NBC | Whitney (R) | 1.1/3 | 2.61 |
| 10:00 | CBS | The Mentalist | 2.5/7 | 12.54 |
| ABC | Private Practice | 2.3/6 | 6.38 | |
| NBC | Prime Suspect (R) | 0.8/2 | 2.84 |
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Nielsen TV Ratings: ©2011 The Nielsen Company. All Rights Reserved.
