The Season 21 finale of Grey’s Anatomy delivered chaos like never before, with Jenna Gatlin taking the hospital hostage and forcing Amelia and Simone into a life-or-death surgery on her daughter while an acetylene gas tank loomed in the OR. Just when the operation miraculously succeeded, a single spark triggered a massive explosion, leaving Meredith’s return, Teddy and Owen’s fractured marriage, Jo and Link’s new chapter, and the fates of Amelia, Simone, Lucas, and others hanging in the balance. Let’s watch the video…