In the Season 12 premiere of Grey's Anatomy , titled , the doctors at Grey Sloan Memorial Hospital treat two teenage girls who were hit by a train in a suicide attempt fueled by bullying and their parents' disapproval of their relationship. Episode Overview Air Date: September 24, 2015. Directed by: Kevin McKidd. Written by: Stacy McKee. Key Storylines

Arizona searches for a roommate and eventually agrees to take in the new intern, Andrew DeLuca, who is struggling to make friends after posing as an attending.

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.

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:

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.

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