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"[S4E22] Cry Havoc" is the 2015 season four finale of NBC’s supernatural drama Grimm , where Nick seeks vengeance against the Royals following his mother's death, culminating in a shocking confrontation with Juliette. The episode, titled after a line in Shakespeare's Julius Caesar , features major plot developments including the death of Prince Kenneth and the arrival of an unexpected third party, with key events recapped by TV Fanatic and detailed on the Grimm Wiki .