The next episode of Grimm, airing on November 16, features the return of Claire Coffee as Adalind, and it sounds like she's out for revenge. NBC has released an official description and images for the episode, which is called "Season Of The Hexenbiest."
Here's the description:
ADALIND RETURNS TO PORTLAND WITH VENGENCE AS HER TOP PRIORITY AND NO ONE IS SAFE - Adalind (Claire Coffee) returns to wreak havoc in everyone's lives and avenge her mother's brutal death. She has her eyes set on Nick (David Giuntoli) and those closest to him - especially Hank (Russell Hornsby) and Juliette (Bitsie Tulloch). Elsewhere, Captain Renard's (Sasha Roiz) obsession continues to escalate. Meanwhile, a surprise visit at the spice shop gives Monroe (Silas Weir Mitchell) more than he ever bargained for. Reggie Lee also stars.
And here are some pics from the November 16 Grimm: