'Grey's Anatomy': Ellen Pompeo and [SPOILER] Reveal How They Pulled Off the Season 17 Premiere Surprise

Spoiler alert! Do not proceed if you have not watched Thursday's two-hour season premiere of Grey's Anatomy. Watch the emotional promo for next week's episode.  After Meredith (Ellen Pompeo) was found unconscious in the Grey Sloan Memorial Hospital parking lot amid the grueling toll coronavirus was taking on her mental,