: Meredith Grey adjusts to life as a widow, moving back into her mother's house with her "sisters," Maggie Pierce and Amelia Shepherd. A major mid-season arc involves Meredith being brutally attacked by a patient, leading to a long recovery and therapy.
: Miranda Bailey successfully campaigns to become the hospital’s first female Chief of Surgery . Greys Anatomy - Season 12
: Martin Henderson joined the cast as Dr. Nathan Riggs, whose arrival triggers a dark history for Owen Hunt involving his missing sister. : Meredith Grey adjusts to life as a
: This season marked the final regular appearance of Sara Ramirez as Callie Torres. Reception & Ratings Greys Anatomy - Season 12