Ratings In its original American broadcast on December 10, 2009, "Grey Matters" was watched by an estimated 6.33 million viewers according to
Nielsen Media Research. The episode earned a 2.3 ratings among people 18–49, slightly above the season average of 2.2; it was down 0.2 ratings points from the previous week.
Reviews The episode premiered to near universal critical acclaim. Ramsey Isler of
IGN gave it 9.6/10, and thought it was "one of the most balanced and well-executed episodes of the series,
Fringe fans get action, suspense, emotion, and best of all, some revelations!... This episode is nearly everything a
Fringe fan could have asked for... Besides the awesomeness with the Bishops, Olivia finally returns to taking an active role in an episode... But the most important thing is that the overarching
Fringe plot finally progressed, and it's going in a pretty damn good direction". Jane Boursaw from
TV Squad enjoyed the episode because it had a "few reveals and a nice
cliffhanger." She liked the interactions between Walter and Peter, and also praised the scene between Olivia and Newton. Josh Wigler of
MTV was pleased that the "mystery of the week" also tied into the ongoing plot, and that answers were provided to certain mysteries, such as why Walter's behavior and personality is "a little...off. Pretty interesting stuff. It's nice to finally have a reason to point at for Walter's craziness". Ken Tucker of
Entertainment Weekly thought it "was one of the best
Fringes yet for the way it wove its sci-fi with its emotional subplots with such tight, artful braiding".
Television Without Pity rated it an
A, while
The A.V. Club's Noel Murray gave the episode an
A-, explaining "This was, I think, the best
Fringe of the season, and I’m only docking it a notch because it was less about themes and character than it was about plot. But man, what a plot". Various critics lauded Noble's performance. In January 2013, IGN ranked the episode the sixth best of the entire series, explaining that the "story is brilliant, with twists and turns and remarkable acting by both John Noble and Joshua Jackson as they portray a bond that's closer than anything else up to that point... This fantastic episode was an early Christmas present for
Fringe fans."
Awards and nominations Director Jeannot Szwarc submitted "Grey Matters" for the
Primetime Emmy Award for Outstanding Directing for a Drama Series category at the
62nd Primetime Emmy Awards. ==References==