Dr. George O'Malley (T.R. Knight)
Ah, the days of George O'Malley and being an intern. Simpler times, really. Knight has been up to quite a lot since departing from Grey's Anatomy. Most notably being his role in The Good Wife as Jordan Karahalios, a young political consultant. We miss you, George.
Dr. Ellis Grey (Kate Burton)
Kate just couldn't stay away from Shondaland (honestly, who could?). The Alzheimer's must have been cured because Shonda let her become Vice President of the United States on Scandal when she played Sally Langston, arguably crazier and more controlling than Ellie Grey.
Dr. Lexie Grey (Chyler Leigh)
Chyler Leigh is doing just fine since the plane crash, actually. She is now still playing a doctor (and scientist) in the CW's Supergirl.
Dr. Mark Sloan (Eric Dane)
It's been a while since the infamous plane crash of Season 8, but the sting of McSteamy's death at the beginning of Season 9 is still lingering. Not long after leaving Grey's, he signed on to work on a Michael Bay drama/sci-fi series called The Last Ship. And don't worry, Dane still channels his McSteamy-ness.
Dr. Heather Brooks, Dr. Charles Percy, and Dr. Reed Adamson
Tina Majorino (Brooks) went on to play Cindy Mackenzie in the Veronica Mars movie revival, Robert Baker (Percy) has been seen briefly in shows such as Grace and Frankie and Modern Family, and Nora Zehetner (Adamson) played Don Draper's nurse neighbor in Mad Men right after she left Grey's Anatomy.
Dr. Derek Shepherd (Patrick Dempsey)
Since the tragic death of his character at the end of Season 11, Patrick Dempsey went to work on rom-com Bridget Jones's Baby. He's also set to star in a new crime TV series called Micronesian Blues, which is set to air sometime this year.
Have you noticed any of the former doctors of Grey's Anatomy up to anything lately?