Grimm may be inspired by beloved fairy tales, but don't expect any happily-ever-afters. In fact, life is about to get very deadly for all concerned. The hit NBC crime procedural — about a Portland homicide detective, Nick Burkhardt (David Giuntoli), with the power to spot supernatural creatures who masquerade as human beings—will get an early second-season return tonight, fresh from two weeks of heavy promotion during the Olympic Games. (The series airs on Mondays for five weeks, then returns to its previous Fridays-at-9 slot on September 14.) Prepare to get prehistoric.