: Miranda Bailey successfully campaigns to become the hospital’s first female Chief of Surgery .
'Grey's Anatomy' Season 12 Trailer: "Everything Has Changed" Greys Anatomy - Season 12
Season 12 of Grey's Anatomy , which premiered on September 24, 2015, is often described as the "season of rebirth". Following the death of Derek Shepherd in Season 11, the show shifted to a noticeably lighter, more "rom-com" tone, reminiscent of its earliest seasons. : Miranda Bailey successfully campaigns to become the
: 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. : Meredith Grey adjusts to life as a
: Their developing romance culminates in a wedding in the season finale, though Amelia initially has doubts and runs away before the ceremony.
: Martin Henderson joined the cast as Dr. Nathan Riggs, whose arrival triggers a dark history for Owen Hunt involving his missing sister.
: The couple's marriage collapses, leading to a divorce. However, they discover April is pregnant shortly before signing the papers.