Prime-time viewership numbers compiled by Nielsen Media Research for Oct. 17-23. Top 20 listings include the week’s ranking, with viewership for the week and season-to-date rankings in parentheses. An “X” in parentheses denotes a one-time-only presentation.

1. (1) “CSI: Crime Scene Investigation” CBS, 28.5 million viewers.

2. (2) “Desperate Housewives,” ABC, 25.2 million viewers.

3. (4) “Lost,” ABC, 21.4 million viewers.

4. (3) “Without a Trace,” CBS, 19.8 million viewers.

5. (6) “Grey’s Anatomy,” ABC, 18 million viewers.

6. (5) “CSI: Miami,” CBS, 17.9 million viewers.

7. (9) “Survivor: Guatemala,” CBS, 17.8 million viewers.

8. (8) “NCIS,” CBS, 17.7 million viewers.

9. (X) World Series Game 2: Houston vs. Chicago, Fox, 17.2 million viewers.

10. (7) “Commander in Chief,” ABC, 16.3 million viewers.

11. (16) “60 Minutes,” CBS, 16.0 million viewers.

12. (12) “Two and a Half Men,” CBS, 15.6 million viewers.

13. (X) World Series Game 1: Houston vs. Chicago, Fox, 15.0 million viewers.

14. (12) “Cold Case,” CBS, 14.9 million viewers.

15. (14) “ER,” NBC, 14.7 million viewers.

16. (9) “NFL Monday Night Football: St. Louis at Indianapolis,” ABC, 14.4 million viewers.

17. (9) “Law And Order: SVU,” NBC, 14.4 million viewers.

18. (X) National League Championship Series Game 6: Houston vs. St. Louis, Fox, 14.1 million viewers.

19. (15) “CSI: NY,” CBS, 13.9 million viewers.

20. (18) “Extreme Makeover: Home Edition,” ABC, 12.9 million viewers.

The Associated Press