Grey's Anatomy's disaster episodes have become a calling card for the series, but a new medical drama has taken the crown.

A scene-by-scene-recap of Grey’s Anatomy Season 21 Episode 12 Ridin’ Solo where Koracick returns and challenges Mer. Check it out!

Even after Oh left Grey’s Anatomy in 2014, fans still wondered ... She left the series shortly thereafter in season 6 and later expressed regrets about the ordeal. "I am disappointed in myself ...