Russell Hornsby, David Giuntoli Photo

From: Photo Flash: First Look - GRIMM's 'Natural Born Wesen,' Airing 3/15

On GRIMM's upcoming episode, titled 'Natural Born Wesen,' The Wesen code of honor comes into question when Nick (David Giuntoli), Hank (Russell Hornsby) and Monroe (Silas Weir Mitchell) discover a series of bank robberies with Wesen using true natures as their disguises. Meanwhile, Juliette (Bitsie Tulloch) finds herself tormented by faint, slowly returning memories that cause her to question her mental state. Sasha Roiz, Reggie Lee, Bree Turner and Claire Coffee also star. 'Natural Born Wesen' airs March 15 at 9 p.m. on NBC.