Photo Flash: GRIMM's 'Endangered,' Airing 4/26

On GRIMM's upcoming episode, titled "Endangered," Mysterious cow mutilations and reports of glowing creatures put Nick (David Giuntoli) on a case that forces him to question the existence of aliens within the Wesen world. He also meets a strange UFO expert who seems to know more than he's letting on. Meanwhile, Nick digs further into the key, and Juliette's (Bitsie Tulloch) romantic memories of Nick start coming back in a big way. Russell Hornsby, Silas Weir Mitchell, Sasha Roiz, Reggie Lee, Bree Turner and Claire Coffee.

"Endangered" airs Friday, April 26 at 9:00 p.m. on NBC. Check out a first look below!

Photos by: Scott Green/NBC

David Giuntoli, Silas Weir Mitchell, Bree Turner

Silas Weir Mitchell as Monroe, Bree Turner

David Giuntoli, Silas Weir Mitchell, Bree Turner

Erin Way, Eric Tiede

Silas Weir Mitchell, David Giuntoli

Bree Turner