NBC again edged ahead of its Big Four rivals in adults 18-49 last week, but Univision has made it two straight frames as the top-rated network overall in the key demo.

With its year-round slate of firstrun telenovelas, the Spanish-language Univision typically stacks up better relative to the major networks in the summer than during the traditional TV season. It won a couple of times last summer too.

The network is especially dominant among the younger 18-34 segment of the prime 18-49 demo, and has now won four consecutive weeks in this age group.

Discovery, meanwhile, led cable in key demos with its Shark Week -- setting ratings records for the event in women 18-49, women 25-54 and adults 25-54. It also stood as the No. 1 network on all of television in men 18-49.

Overall, according to "live plus same-day" Nielsen estimates for the week of Aug. 11-17, Univision finished on top in adults 18-49 with a 1.3 rating/5 share. It was followed by NBC (1.1/4), CBS, Fox and ABC (all at 1.0 rating) and top cabler Discovery (0.9/3).

NBC edged past CBS to win in adults 25-54, while the Eye prevailed among total viewers.

Univision was paced by Friday's grand finale of "Lo Que la Vida Me Robo" (What Life Took From Me)," which was the night's No. 1 program in adults 18-49 (2.0/8) and drew 5.13 million total viewers.

At NBC, "Running Wild With Bear Grylls" hit a high in its third week with Channing Tatum as the celebrity participant (1.5/5 in 18-49, 4.54 million viewers overall), and "Last Comic Standing" jumped four tenths week to week for its season finale on Thursday (1.4/5 in 18-49, 4.87 million viewers overall).

For a second straight week, CBS' "Big Brother" occupied the top three spots in the 18-49 program rankings (including a tie for No. 3), with Thursday's episode (2.2/8 in 18-49, 6.44 million viewers overall) drawing the show's largest audience on any night this summer. "Extant" (1.0/3 in 18-49, 5.68 million viewers overall) held at the previous week's level, again beating its firstrun drama competition on NBC ("Taxi Brooklyn") and ABC ("Motive").

ABC drew a sizable audience on Tuesday for a one-hour "20/20" special on the life and death of Robin Williams (1.7/6 in 18-49, 7.36 million viewers overall), which placed in the week's top 10.

The net's "NY Med" concluded a solid second season Thursday (0.9/3 in 18-49, 4.97 million viewers overall); the docuseries, which consistently won its timeslot in total viewers, finished up by about 25% from its prior edition (in 2012).

Fox was paced by Sunday's preseason NFL game between Kansas City and Carolina (2.1/7 in 18-49, 6.22 million viewers overall) and Monday's "MasterChef" (1.9/6 in 18-49, 5.40 million viewers overall). Thursday's "Gang Related" wrapped its season with a slight ratings bump (0.7/2 in 18-49, 2.36 million viewers overall).

At CW, "Whose Line Is It Anyway" hit a summer high (0.7/2 in 18-49, 1.87 million viewers overall), logging the timeslot's best demo result since January 2012 and its largest overall audience there since December 2010. And Wednesday's "Penn & Teller: Fool Us" (0.5/2 in 18-49, 1.68 million viewers overall) held at its solid premiere-week level.

Discovery's "Shark Week" wrapped July 16 with the event's largest-ever average audience in adults 25-54 (1.40 million), women 18-49 (639,000) and women 25-54 (621,000). The top telecasts last week were Monday's hourlongs "Monster Hammerhead" (3.45 million; 1.93 million adults 18-49) and "Jaws Strike Back" (3.41 million, including 2 million adults 18-49) and Tuesday's "Alien Sharks: Return of the Abyss" (3.11 million; 1.82 million adults 18-49) and "Lair of the Mega Shark" (2.78 million; 1.64 million adults 18-49).

The opening-night July 10 movie "Shark of Darkness: Wrath of Submarine" turned out to be the top-rated overall (3.83 million viewers overall; 2.38 million adults 18-49).

Elsewhere, last week was a transitional one for many cable networks, as a slew of shows bowed while others wrapped or neared the finish line.

At TNT, Wednesday's 10 p.m. season premiere of "Franklin & Bash" (0.28 rating in 18-49, 1.97 million viewers overall) delivered just half of its year-ago premiere demo rating when it aired at 9. The net fared better in the hour preceding "Franklin" with the series premiere of Sean Bean-fronted drama "Legends" (0.52 rating in 18-49, 2.58 million viewers overall); to date, the "Legends" pilot has been seen by about 8 million since its linear premiere, including encores, DVR playback, VOD and digital on-demand.

"Major Crimes" ended its summer strong (0.84 in 18-49, 5.73 million viewers overall). It was the week's most-watched cable program, and overall, TNT could claim seven of basic cable's 10 most-watched original dramas. The net also had the week's top three cable dramas in adults 25-54: "The Last Ship," "Rizzoli & Isles" and "Major Crimes."

Following "Major Crimes" on Monday, "Murder in the First" closed out its first season with a ratings spike (0.47 in 18-49, 3.39 million viewers overall).