In "Grimm" season 5 peisode 20, Wu's (Reggie Lee) transformation as a non-Wesen lycanthrope places his friends in a tough predicament.

 In "Bad Light" the police officer himself will struggle to accept what he has become. Nick (David Guintolli) and Monroe (Silas Weir Mitchell) brings Wu to Rosalee (Bree Turner) for an examination after finding him covered in blood after killing a Black Claw minion. Unfortunately, Rosalee cannot do much for him due to the lack of certainty on what kind of creature he is.

Wu's transformation to an unknown mondter began when a lycanthrope scratched his leg during a raid. Since then, Wu found himself unable to remember the events of the previous night. Wu's mind is a state of chaos because of the events that transpired, lessening the chances for him to understand what is happening to him at the moment.

The episode also reveals that Zuri's (Sharon Leal) sweetness towards Hank (Russel Hornsby) is a maneuver for her to mask the fact that she is currently scheming with the devious Black Claw. Another important event in the episode is the disappearance of Adalind (Claire Coffee) and Kelly. This brings the future for Nick and Adalind as a couple into a total vagueness.

The teaser video released by the NBC shows Nick assuming the Grimm persona as he confronts Capt. Sean Renard. Next Friday's episode is the last before the two-part season-finale.

The next episode of "Grimm" Season 5 entitled "Bad Night" airs on May 13 on NBC.