Greys Anatomy - Season 12 Direct

: Jason George (Ben Warren) was promoted to a series regular. Giacomo Gianniotti (Andrew DeLuca) also became a regular mid-season.

: Martin Henderson joined the cast as Dr. Nathan Riggs, whose arrival triggers a dark history for Owen Hunt involving his missing sister. Greys Anatomy - Season 12

: Their developing romance culminates in a wedding in the season finale, though Amelia initially has doubts and runs away before the ceremony. : Jason George (Ben Warren) was promoted to a series regular

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. Nathan Riggs, whose arrival triggers a dark history

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

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

: 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.