NBC’s Friday night drama series Grimm will keep going as the supernatural crime drama has received another early renewal by the network for a sixth season.

Grimm was a lower-profile entry when it debuted in fall 2011 alongside another fairytale-themed drama that is still going strong, ABC’s Once Upon a Time. The NBC genre drama, produced by Sean Hayes and Todd Milliner, became a sleeper hit, the first scripted success for the network’s new regime and the only series from Bob Greenblatt’s first batch of shows that is still around. NBC tried launching other genre dramas with Grimm on Friday, some with higher-profile pedigree, but Grimm outlasted them all — Hannibal, Dracula, Crossbones and Constantine. Grimm also is owned by NBC, which makes it a solid financial performer for NBCUniversal with solid international and SVOD sales.

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Grimm joins previously renewed NBC dramas The Blindspot, Shades of Blue, Chicago Fire, Chicago PD, Chicago Med and Law & Order: SVU as well as comedy Superstore.

“We absolutely love what our producers and cast have accomplished over the past five seasons,” NBC Entertainment Jennifer Salke said. “They have created a whole new world of creatures and have a truly devoted fan base. We can’t wait to see what comes next.”

This season, Grimm originals are averaging a 1.7 rating in adults 18-49 and 6.4 million viewers overall in Live+7. Grimm is one of the most time-shifted series on the broadcast networks, growing by an average of +90% in adult 18-49 rating (from a 0.91 to a 1.73) and more than 2.4 million viewers overall (3.9 million to 6.4 million) from Live+Same Day to Live+7. Grimm also generates an upscale audience, indexing at a 111 among adults 18-49 living homes with $100K+ incomes (with 100 representing an average concentration of those high-income homes).

As the nefarious forces of Black Claw take hold of Portland, Nick (David Giuntoli) must take a stand to protect his city and those closest to him, especially his child with Adalind (Claire Coffee). It will take the full force of Nick and his allies to find a way to bring the Wesen uprising to a halt. Grimm also stars Russell Hornsby, Bitsie Tulloch, Silas Weir Mitchell, Reggie Lee, Bree Turner and Sasha Roiz.

Grimm is a Universal Television and Hazy Mills production. The series was created by David Greenwalt & Jim Kouf and Stephen Carpenter. Sean Hayes, Todd Milliner and Norberto Barba serve as executive producers along with Greenwalt and Kouf.