Greys Anatomy - Season 12 -

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

: This season marked the final regular appearance of Sara Ramirez as Callie Torres. Reception & Ratings 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. Following the death of Derek Shepherd in Season

: Tension peaks when Callie’s new girlfriend, Penny, is revealed to be one of the doctors who failed to save Derek. Penny eventually joins the hospital as a resident, causing friction with Meredith and Amelia. Relationship Turmoil :

: Their developing romance culminates in a wedding in the season finale, though Amelia initially has doubts and runs away before the ceremony.