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" Grimm " Season 4, Episode 19, titled "," originally aired on April 24, 2015. This episode serves as a major turning point for the season, particularly regarding the dissolution of Nick and Juliette's relationship. Plot Summary: "Iron Hans"

The episode follows two main threads: a Wesen-focused "Monster of the Week" investigation and critical developments in the series' overarching mythology. Grimm season 4 episode 19 review: Iron Hans | Den of Geek