NBC easily captured the first Tuesday of the summer television season behind summer perennial “America’s Got Talent,” which was down from last year but dominated the night, and a promising debut for “I Can Do That.” It was slow going, though, for Fox’s “Are You Smarter Than a 5th Grader,” which was back in primetime for the first time in nearly six years.

According to preliminary national estimates from Nielsen, “America’s Got Talent” (pictured) averaged a 2.6 rating/9 share in adults 18-49 and 10.9 million viewers overall from 8 to 10 p.m., down 13% (0.4) from last year but more than double any other show in its time period. The show’s 10th-season premiere matched last week’s result for the final performance edition of NBC’s “The Voice” and out-rated last week’s reality finales of ABC’s “Dancing With the Stars” and CBS’ “Survivor” (both at 2.3).

“Talent” led into the debut of “I Can Do That” (1.8/6 in 18-49, 6.5 million viewers overall), which dominated its timeslot — beating the combined demo totals of programming on ABC and CBS. Last year, on the night that “Talent” kicked off its season with a 3.0 demo rating, medical drama “The Night Shift” opened with a 1.6, which tied CBS’ premiere of “Extant” as last summer’s highest-rated broadcast premiere of summer. The highest-rated unscripted bow of last summer was ABC’s “Rising Star” (1.5).

At ABC, seven-night gameshow “500 Questions” (1.1/4 in 18-49, 4.7 million viewers overall) matched the previous night’s rating despite facing NBC’s strong “America’s Got Talent” as well as competition from another gameshow, Fox’s “Are You Smarter Than a 5th Grader” (0.8/3 in 18-49, 3.3 million viewers overall), which was back on the network with original host Jeff Foxworthy returning.

Following “500 Questions” on ABC was the season premiere of “Extreme Weight Loss” from 9 to 11 p.m. (0.9/3 in 18-49, 2.9 million viewers overall), down  31%. And at Fox, it was a modest time-period premiere for “Hell’s Kitchen” (1.1/3 in 18-49, 3.3 million viewers overall).

CBS was competitive with the firstrun lineups on ABC and Fox with its repeat crime programs “NCIS” (1.0/4 in 18-49, 8.5 million viewers overall), “NCIS: New Orleans” (0.9/3 in 18-49, 7.6 million viewers overall) and “48 Hours” (0.9/3 in 18-49, 5.6 million viewers overall).

CW re-broadcast the pilot episode of “The Flash” (0.4/2 in 18-49, 1.7 million viewers overall), followed by one of the final original episodes in the first season of “iZombie” (0.6/2 in 18-49, 1.8 million viewers overall). As happened earlier in its run, “iZombie” fared about as well with an original lead-in as with a repeat, suggesting it has its own audience and that it’s not all that great of a match with “Flash.”

Preliminary 18-49 averages for the night: NBC, 2.3/8; Fox, 1.0/3; ABC and Fox, 1.0/3; Univision, 0.9/3; CW and Telemundo, 0.5/2.

In total viewers: NBC, 9.5 million; CBS, 7.2 million; ABC, 3.5 million; Fox, 3.3 million; Univision, 2.3 million; CW, 1.8 million; Telemundo, 1.3 million.