Grimm: Season 4 Episode 21: Headache
Starring: David Giuntoli, Russell Hornsby, Elizabeth Tulloch, Silas Weir Mitchell, Sasha Roiz, Reggie Lee, Nico Evers-Swindell
Length: 42 minutes
On Air Date: 8 May 2015
Grimm: S04E21 Description: As Hank and Nick get close to identifying a vicious serial killer, Wu’s life is put into jeopardy.