Fast National ratings for Monday, August 13, 2012.
 
The pre-season out-of-time-period return of "Grimm" won its hour with ease, but the less-than-huge premiere for "Stars Earn Stripes," plus a big audience for "Hell's Kitchen" let FOX end NBC's two-plus weeks of Olympics-driven primetime domination.
 
Among adults 18-49, FOX averaged a 2.3, knocking NBC down to second in the key demographic with a 1.8 rating. CBS averaged a 1.3 key demo rating, followed by the 1.1 rating for ABC. The CW averaged a 0.2 key demo rating for the night.
 
Overall, FOX averaged an estimated 5.79 million viewers and a 3.3 rating/5 share for Monday primetime, beating NBC's 3.1/5 and 5.33 million viewers and CBS' 3.2/5 and 4.91 million viewers. ABC averaged a 2.4/4 and 3.405 million viewers, with The CW averaged a 0.4/1 and 606,000 viewers.
 
[Univision averaged 3.35 million viewers and a 1.3 rating among adults 18-49 for Monday night.]
 
8 p.m. - NBC started primetime in first overall with the 5.26 million viewers for the launch of "Stars Earn Stripes," which came ins second with a 1.6 rating among adults 18-49. FOX's premiere of "Hotel Hell" averaged 5.12 million viewers for second and won the hour with a 1.9 key demo rating. [The Gordon Ramsay series also beat "Stars Earn Stripes" overall in the 8:30 half-hour.] CBS' repeats of "How I Met Your Mother" and "2 Broke Girls" averaged 4.49 million viewers and a 1.3 key demo rating for third, topping the 4.24 million viewers and a 1.2 key demo rating for "Bachelor Pad." The CW's repeat of a "Perez Hilton All-Access" special averaged 820,000 viewers and a 0.3 key demo rating.
 
9 p.m. - FOX comfortably took over the 9 p.m. hour with 6.46 million viewers and a 2.7 rating among adults 18-49 for "Hell's Kitchen." CBS was second overall with 5.07 million viewers for repeats of "2 Broke Girls" and "Mike & Molly," coming in third with a 1.5 key demo rating. NBC's "Stars Earn Stripes" averaged 5.04 million viewers and held up in second with a 1.7 key demo rating in its second hour. ABC's "Bachelor Pad" averaged 3.875 million viewers and a 1.2 key demo rating in fourth. On The CW, "Remodeled" returned with a new episode and averaged a woeful 392,000 viewers and a 0.1 key demo rating, posting a "0" share both overall and in the demo.
 
10 p.m. - "Grimm" started its temporary move to Mondays with 5.68 million viewers and a 2.0 rating among adults 18-49 for NBC. CBS' repeat of "Hawaii Five-0" was second with 5.16 million viewers and a 1.2 key demo rating, far ahead of the 2.09 million viewers and 0.7 key demo rating for ABC's new "The Glass House."
 
All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.