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Things aren't looking good for Monday night science-fiction television.

"Heroes," a signature show of NBC since it premiered three years ago, is clocking in by far its lowest ratings ever. It scored a 5.0 rating/7 share Monday night, a drop of more than 12 percent from last week, and down 18 percent from its already anemic season premiere just a few weeks ago.

Those numbers are from Fast National ratings from Nielsen Media Research, which also measured a 3.5/5 for "Terminator: The Sarah Connor Chronicles" on Fox, slightly larger than the audience from the previous week.

"Heroes" was beat by everything that aired in the 8 p.m. hour, beating "Prison Break" on Fox and reruns on The CW. It was easily beaten by "Dancing With the Stars" and comedies on CBS.

"Sarah Connor" was only able to beat a rerun of "Gossip Girl" on The CW, finishing well behind "Dancing" on ABC as well as comedies on CBS. It's closest competition was "Chuck" on NBC, which earned a 3.8/6, according to Zap2it.

In the key demographic of adults 18 to 49, NBC finished third with a 2.8 rating, ahead of the 2.2 from Fox. Overall, NBC finished in third place behind ABC and CBS with a 4.2/6 while Fox ended up in fourth place with a 3.5/5.

Fast Nationals usually provide a snapshot of what Americans are watching by pulling numbers from the top urban markets that includes both live viewing and same-day timeshifted viewing. A rating point generally represents more than 1.1 million households while the share indicates the percentage of televisions turned on that was tuned to the specific program. These numbers typically shift when final ratings are issued.

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