NBC has released a spoiler description for the April 27 episode of Grimm, which is titled "Leave It To Beavers."
A LONG STANDING FEUD COMES TO LIGHT AND NICK TAKES STEPS TO UNLEASH HIS INNER GRIMM -- DAVID ZAYAS ("DEXTER") GUEST STARS -- As Nick (David Giuntoli) delves into the trailer's weapons cabinet and his inner Grimm, the investigation of a dead construction worker leads him into a long standing conflict in the creature world. Sensing an unfamiliar threat, the suspect takes it upon himself to summon reapers to town to eliminate the Grimm once and for all. Meanwhile, Juliette (Bitsie Tulloch) insists that Nick invite Monroe (Silas Weir Mitchell) over for dinner, making for quite the interesting evening. Russell Hornsby, Sasha Roiz and Reggie Lee also star.