Check out these sneak peeks and reviews to see the doctors of Grey Sloan Memorial in action as they kick off Season 12: Grey's Anatomy Promo - "Sledgehammer" (12x01) YouTube · Henri H GREY'S ANATOMY Sneak Peek 12x01 - "Sledgehammer" (2) YouTube · Tanja B Grey's Anatomy | 12.01 | "Sledgehammer" | sneak peek #1 YouTube · MariaCallizonaFAN

The case of the two young girls prompts several doctors to reflect on their own pasts. Alex Karev reveals he was bullied for being overweight as a child, while Maggie's frustrations culminate in her punching one of the girls' homophobic mothers.

April returns from her deployment in Jordan, but her reunion with Jackson is cold and distant as they struggle with their marital issues.

Meredith adjusts to living in her old home with her half-sister, Maggie Pierce, and sister-in-law, Amelia Shepherd. Tensions rise as Amelia begins physically tearing down a wall in the house, eventually leading to a symbolic moment of reconciliation where all three sisters take turns swinging the sledgehammer.

Miranda Bailey competes against Dr. Tracy McConnell for the Chief of Surgery position. Despite feeling intimidated by McConnell's credentials, Bailey secures the role after delivering a powerful presentation while performing surgery. Relationship Tensions: