EXCLUSIVE: Grimm co-creators David Greenwalt and Jim Kouf have signed a new overall deal with Universal TV. Under the pact, the writing partners will continue as executive producers on the NBC drama, produced by Universal TV and Sean Hayes and Todd Milliner’s Hazy Mills. Grimm, which Greenwalt and Kouf co-created with Stephen Carpenter, was recently picked up for a third season with an early renewal. Grimm, inspired by the classic Grimm Brothers’ Fairy Tales, has been an unsung hero at NBC. It is the only series from the 2011-12 season, the first overseen by NBC’s current regime, to make it to season 3. A rare success story on Friday, Grimm is the night’s No.1 series in adults 18-49. Its most recent second season (6.9 million viewers, 2.4 in 18-49 in Live+7) was up 14% in 18-49 and 12% in total viewers vs. Season 1. Greenwalt and Kouf exec produce the series with Hayes, Milliner and Norberto Barba.Greenwalt, repped by APA and attorney Alan Hergot, previously co-created cult series Profit, executive produced Buffy The Vampire Slayer and co-created and executive produced its spinoff, Angel, on which Kouf served as a writer-producer. WME-repped Kouf also co-exec produced CBS’ Ghost Whisperer and co-wrote the features National Treasure and Rush Hour.