We can't remember the last time ABC aired a completely dialogue-less promo for an upcoming Grey's Anatomy episode like they did for the May 15 Season 10 finale — aka Season 10, Episode 24: "Fear (of the Unknown)."

Instead we just saw shots of the doctors in all-hands-on-deck mode in the wake of a mass-casualty event that floods the hospital with patients — Owen (Kevin McKidd) looking overloaded, Meredith (Ellen Pompeo) looking teary, Alex (Justin Chambers) looking sweaty, etc.

"The goodbye you never expected," reads the on-screen text — which makes us even more sure that the finale will be a deadly one for at least one of our beloved surgeons.

We've rounded up all the intel we have on the episode here, and below is ABC's synopsis of the installment.

In the Season 10 finale, the doctors of Grey Sloan Memorial Hospital bid an emotional farewell to the beloved Cristina Yang (Sandra Oh). A possible act of terrorism rocks Seattle and causes chaos at the hospital. Meanwhile, Meredith (Ellen Pompeo) makes a life-changing decision, and one doctor receives shocking news.

Grey's Anatomy Season 10, Episode 24 — "Fear (of the Unknown)" — airing Thursday, May 15, at 9 p.m. ET.


Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!