ABC's "Grey's Anatomy" has promoted Camilla Luddington, Gaius Charles, Jerrika Hinton and Tessa Ferrer to series regulars for Season 10, a studio representative confirmed to TheWrap.
The four actors joined the medical drama's last season in recurring roles: Luddington as Jo Wilson, Charles as Shane Ross, Hinton as Stephanie Edwards and Ferrer as Leah Murphy.
All four actors appeared on the Season 9 finale, "Perfect Storm," in which the hospital lost power and the staff was forced to work in the dark.
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They were added in the wake of Season 8's devastating deaths and injuries in a plane crash storyline that carried through into the show's ninth year.
The series' Season 9 finale earned a 3.0 rating/8 share with 8.6 million total viewers — a 27 percent decrease from the previous season's finale. Despite the dramatic drop in viewership, ABC renewed the series in May.
TVLine first reported the promotions.