Sneak Peek new images and synopsis from the "Grimm" episode, titled "Goodnight Sweet Grimm", directed by Norberto Barba, airing May 21, 2013 on NBC:
"...just when things look like they’re back to normal with 'Juliette', 'Nick' is called to investigate a flurry of rage-fueled assaults happening all over Portland.
"He goes to 'Monroe' and 'Rosalee' for help battling Portland’s newest wave of 'undead'.
"As if that weren’t enough, 'Captain Renard' informs Nick that his brother 'Eric' is in town on family business.
"Meanwhile, 'Stefania' and 'Frau Pech' methodically use their alliances with 'Adalind' to battle one another..."
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