David Giuntoli, left, as Nick Burkhardt and Russell Hornsby as Hank Griffin in “Grimm.”
David Giuntoli, left, as Nick Burkhardt and Russell Hornsby as Hank Griffin in “Grimm.” NBC Scott Green/NBC
David Giuntoli, left, as Nick Burkhardt and Russell Hornsby as Hank Griffin in “Grimm.” NBC Scott Green/NBC

What to Watch on Friday: A ‘Grimm’ war in 2-hour season finale

May 20, 2016 06:00 AM