Fantasy series Grimm may have said goodbye just one year ago, but it's already gearing up for a comeback. There's a spinoff in the works between NBC and Marvel's Iron Fist writer Melissa Glenn, Variety reported Tuesday. The untitled reboot will certainly include touches of the original show, since its executive producers, Sean Hayes and Todd Millier, and its creators, David Greenwalt and Jim Kouf, are reportedly coming on as producers. The original Grimm followed Portland homicide detective Nick Burkhardt, played by David Giuntoli, who discovers he comes from a long line of guardians sworn to protect the mortal world from mythological creatures called Wesen.