Grimm
NBC, 9:00 p.m. ET
It’s an evening in which, by coincidence, some of the Friday night genre shows earn special mention for one reason or another. On this show, it’s because the guest star is Amy Acker, playing a woman who dons various disguises to go out on the prowl in search for male victims. (Where do I sign?) And her appearance here is a reunion of sorts: She co-starred on Angel, a series co-created by David Greenwalt, one of the executive producers of Grimm.