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NBC has added to its large inventory of firstrun summer programming with premiere dates for two more series: returning medical drama “The Night Shift” and new alternative competition series “Spartan: Ultimate Team Challenge.”

The network announced Friday that “The Night Shift” will kick off its third season on Wednesday, June 1 at 10. That will give it a three-week head start opposite CBS’ new scripted drama “American Gothic,” which bows June 22.

“Night Shift,” one of three medical dramas currently on the NBC roster (alongside “Chicago Med” and “Heartbeat”), averaged a 1.8 rating in adults 18-49 and 7 million viewers overall during its second season on Mondays last spring, according to Nielsen’s “live plus-7” averages. The series from Sony Pictures Television stars Eoin Macken, Jill Flint, Ken Leung, Brendan Fehr, Robert Bailey Jr., JR Lemon, Tanaya Beatty and Scott Wolf.

“Spartan: Ultimate Team Challenge” makes its debut Monday, June 13 at 10 p.m., with a special preview episode airing behind “American Ninja Warrior.” It will have another preview the following Monday, before sliding into its regular 9 p.m. Thursday timeslot on June 23, where its competition will include CBS’ “Big Brother.”

Inspired by Spartan Race — the creators of the world’s most demanding obstacle course races — “Spartan: Ultimate Team Challenge” raises the bar on team competitions. Groups of friends, families, co-workers and more must work together as they race across specially challenged Spartan courses engineered to test their determination, endurance and will. Teams of five will compete on one of the most demanding courses ever devised and will have to push through the pain to win $250,000.

“Spartan: Ultimate Team Challenge” is executive produced by A. Smith & Co. Productions’ founders Arthur Smith and Kent Weed (“Hell’s Kitchen,” “Unsung, “Ellen’s Design Challenge”), along with Anthony Storm (“American Ninja Warrior”).