Photo Flash: First Look - GRIMM's Season Finale, Airing 5/21

On GRIMM's upcoming second season finale, aptly titled "Goodnight, Sweet Grimm," just when things look like they're back to normal with Juliette (Bitsie Tulloch), Nick (David Giuntoli) is called to investigate a flurry of rage-fueled assaults happening all over Portland. He goes to Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) for help battling Portland's newest wave of "undead." As if that weren't enough, Captain Renard (Sasha Roiz) informs Nick that his brother Eric (guest star James Frain) is in town on family business. Meanwhile, Stefania (guest star Shohreh Aghdashloo) and Frau Pech methodically use their alliances with Adalind (Claire Coffee) to battle one another. Russell Hornsby and Reggie Lee also star.