Fringe, "Grey Matters" - Get ready for more gruesome mad lab science on Fringe as the team investigates a mental patient who ends up with an exposed brain after an impromptu surgery. While Mojo Jojo runs around, Olivia is drawn back into the dueling universes arc following a shape-shifter sighting and a visit from William Bell (Leonard Nimoy). With all of this distracting stuff going on, will anyone have time to save Walter from the evil brain doctor's clutches? We'll find out tonight. (10 p.m. ET on Fox)
Head after the jump for behind the scenes and preview clips.