Anatomy - Season 12 - Greys

'Grey's Anatomy' Season 12 Trailer: "Everything Has Changed"

: Miranda Bailey successfully campaigns to become the hospital’s first female Chief of Surgery .

: Alex proposes multiple times, but Jo repeatedly declines because she is secretly still married to an abusive man she fled years prior. Cast Transitions Greys Anatomy - Season 12

: 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.

: Martin Henderson joined the cast as Dr. Nathan Riggs, whose arrival triggers a dark history for Owen Hunt involving his missing sister. 'Grey's Anatomy' Season 12 Trailer: "Everything Has Changed"

: The couple's marriage collapses, leading to a divorce. However, they discover April is pregnant shortly before signing the papers.

: Their developing romance culminates in a wedding in the season finale, though Amelia initially has doubts and runs away before the ceremony. A major mid-season arc involves Meredith being brutally

: A bitter custody battle over their daughter, Sofia, ensues when Callie plans to move to New York with Penny.