In the sneak peek, which you can view at E! here, we learn that Cristina, though physically okay, is in a state of "reactive psychosis" after the crash. She refuses to talk, but when anyone tries to treat her she lashes out — violently.
We see both of her "people," Owen (Kevin McKidd) and Meredith (Ellen Pompeo) (who seems to be relatively fine), trying to help. First Owen braves her outbursts to hold her close, and then Mer tries berating and begging to get her to respond.
We're calling it now: There's no way we'll get through this episode without several packs of tissues.
Catch the next new episode of Grey’s Anatomy on Thursday, October 4 at 10 p.m. ET/PT onABC.