“Grey’s Anatomy” airs an all-new season on Thursday, September 26 (9/26/2024) at 10 p.m. ET on ABC. A live stream of the season 21 premiere can be found on fuboTV (free trial) and Sling (half off the first month).The first episode of the new season is titled “If Walls Could talk.” Following the dismissal of several top staff members at Grey Sloan, Catherine keeps meddling in Meredith and Amelia’s research. Meanwhile, accidents at a climate change protest result in unusual cases arriving at the hospital, and Bailey faces a surprising encounter from her past.