“Grimm” (8 p.m., NBC): The weirdness continues as Nick’s (David Giuntoli)

“Grimm” (8 p.m., NBC): The weirdness continues as Nick’s (David Giuntoli) investigation into the murder of a construction worker reveals a long-running feud in the creature world, which leads the suspect to summon reapers to get rid of the Grimm. And please don’t ask us to explain.

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