NBC got a powerful start out of “Meet My Folks” last night in the reality show’s regular-slot debut, winning the 8-9 p.m. ET hour in all key demographics and improving on the network’s summer time-period average by 62 percent among adults 18-49.

According to updated in-home viewing figures from Nielsen Media Research, Wednesday's regular-slot premiere of “Meet My Folks” (3.4 rating, 11 share among adults 18-49, 7.3 million viewers overall) won the hour among adults 18-49 by a commanding margin of 26 percent (3.4/11 vs. ABC’s second-place 2.7/9). “Folks” defeated Fox’s rival hour of reality programs ('30 Seconds To Fame' and 'American Idol') by 31 percent (3.4/11 vs. 2.6/8).

From its first half-hour to its second, “Meet My Folks” built its 18-49 rating by 23 percent (to a 3.8/12 from a 3.1/11). Among adults 18-34, the build was 33 percent (to a 4.0/14 from a 3.0/11). “Folks” led the hour among adults, men and women 18-34; adults, men and women 18-49; and adults, men and women 25-54.

Heading into Wednesday, NBC was averaging a 2.1 rating among adults 18-49 in the Wednesday 8-9 p.m. ET hour since the end of the May sweep, a figure “Meet My Folks” topped by 62 percent. “Folks” generated NBC’s highest 18-49 rating in the time period since the May sweep.

NBC previewed “Meet My Folks” this past Monday night and attracted a 5.5/16 among adults 18-49 and 11.0 million viewers overall. The 5.5 rating equals the highest 18-49 result for any non-sports telecast on any network since May.