| Rk | Show | Rating | Last Year | High | Week | Low | Week | Stability IR |
| 1 | Eleventh Hour (CBS)^^..... | 7.5/13..... | NA.......... | 9.7/16..... | 18........... | 5.2/8..... | 17............ | 77.6 |
| 2 | Fringe (Fox)#..... | 6.3/10..... | NA.......... | 8.2/13..... | 2........... | 5.2/8..... | 12............ | 76.5 |
| 3 | Lost (ABC)#..... | 5.8/9..... | 7.7/12.......... | 6.8/10..... | 19........... | 5.0/8..... | 30............ | 85.6 |
| 4 | Harper's Island (CBS)^^..... | 5.7/10..... | NA.......... | 6.7/12..... | 30........... | 5.0/9..... | 32............ | 84.6 |
| 5 | Heroes (NBC)#..... | 4.7/7..... | 6.6/10.......... | 6.1/9..... | 3........... | 3.8/6..... | 30............ | 76.9 |
| 6 | Life On Mars (ABC)^^..... | 4.5/8..... | NA.......... | 7.7/13..... | 5........... | 3.0/5..... | 26............ | 59.1 |
| 7 | Chuck (NBC)#..... | 4.0/6..... | 4.8/7.......... | 4.9/7..... | 21........... | 3.5/5..... | 26/29............ | 80.9 |
| 8 | Knight Rider (NBC)^^..... | 3.7/6..... | NA.......... | 4.9/8..... | 6........... | 2.7/5..... | 16............ | 72.7 |
| 9 | Pushing Daisies (ABC)^^..... | 3.5/6..... | 6.3/10.......... | 4.2/7..... | 6........... | 2.7/5..... | 12............ | 83.6 |
| 10 | Kings (NBC)^^..... | 3.2/5..... | NA.......... | 4.1/7..... | 27........... | 2.5/3..... | 30............ | 78.5 |
| 11 | Sarah Connor (Fox)^^..... | 2.9/5..... | 5.6/9.......... | 4.1/6..... | 1........... | 1.8/3*..... | 25............ | 70.7 |
| 12 | Dollhouse (Fox)#..... | 2.4/4..... | NA.......... | 2.8/5..... | 22........... | 1.7/3..... | 34............ | 84.5 |
| 13 | Smallville (CW)#..... | 2.4/4..... | 2.6/4.......... | 2.9/5..... | 9/11........... | 2.0/3..... | 32/33............ | 84.0 |
| 14 | Supernatural (CW)#..... | 2.1/3..... | 1.9/3.......... | 2.5/4..... | 10........... | 1.8/3..... | 18/19/26/33/34/35............ | 86.2 |
| 15 | Reaper (CW)^^..... | 1.4/2..... | NA.......... | 1.6/3..... | 32........... | 1.2/2..... | 27/33/35/36............ | 86.3 |
RANKED BY SIR| Rk | Show | Rating | Last Year | High | Week | Low | Week | Stability IR |
| 1 | Reaper (CW)^^..... | 1.4/2..... | NA.......... | 1.6/3..... | 32........... | 1.2/2..... | 27/33/35/36............ | 86.3 |
| 2 | Supernatural (CW)#..... | 2.1/3..... | 1.9/3.......... | 2.5/4..... | 10........... | 1.8/3..... | 18/19/26/33/34/35............ | 86.2 |
| 3 | Lost (ABC)#..... | 5.8/9..... | 7.7/12.......... | 6.8/10..... | 19........... | 5.0/8..... | 30............ | 85.6 |
| 4 | Harper's Island (CBS)^^..... | 5.7/10..... | NA.......... | 6.7/12..... | 30........... | 5.0/9..... | 32............ | 84.6 |
| 5 | Dollhouse (Fox)#..... | 2.4/4..... | NA.......... | 2.8/5..... | 22........... | 1.7/3..... | 34............ | 84.5 |
| 6 | Smallville (CW)#..... | 2.4/4..... | 2.6/4.......... | 2.9/5..... | 9/11........... | 2.0/3..... | 32/33............ | 84.0 |
| 7 | Pushing Daisies (ABC)^^..... | 3.5/6..... | 6.3/10.......... | 4.2/7..... | 6........... | 2.7/5..... | 12............ | 83.6 |
| 8 | Chuck (NBC)#..... | 4.0/6..... | 4.8/7.......... | 4.9/7..... | 21........... | 3.5/5..... | 26/29............ | 80.9 |
| 9 | Kings (NBC)^^..... | 3.2/5..... | NA.......... | 4.1/7..... | 27........... | 2.5/3..... | 30............ | 78.5 |
| 10 | Eleventh Hour (CBS)^^..... | 7.5/13..... | NA.......... | 9.7/16..... | 18........... | 5.2/8..... | 17............ | 77.6 |
| 11 | Heroes (NBC)#..... | 4.7/7..... | 6.6/10.......... | 6.1/9..... | 3........... | 3.8/6..... | 30............ | 76.9 |
| 12 | Fringe (Fox)#..... | 6.3/10..... | NA.......... | 8.2/13..... | 2........... | 5.2/8..... | 12............ | 76.5 |
| 13 | Knight Rider (NBC)^^..... | 3.7/6..... | NA.......... | 4.9/8..... | 6........... | 2.7/5..... | 16............ | 72.7 |
| 14 | Sarah Connor (Fox)^^..... | 2.9/5..... | 5.6/9.......... | 4.1/6..... | 1........... | 1.8/3*..... | 25............ | 70.7 |
| 15 | Life On Mars (ABC)^^..... | 4.5/8..... | NA.......... | 7.7/13..... | 5........... | 3.0/5..... | 26............ | 59.1 |
== FINAL ==
* estimated
^^ canceled
# renewed
For the Stability Index Rating, we take the highest overnight rating compared to the overall average overnight rating to create an index number. A
GREEN number shows stabilization compared to the previous new episode, while a
RED number shows a destabilization compared to the previous new episode. Overnight ratings numbers provided by Nielsen Media Research and provided courtesy of Zap2it.