Leighton in 17 Photos

Derek can't believe the events of the past 24 hours.

Derek lays one on Addy.

Addison tells the interns what's going on.

Izzie can't believe what's going on at SGH.

Meredith's roomies.

Dr. Webber announces what's happening.

Addison Shepherd looks on, concerned.

Cristina and company dropped, but the bomb did not go off. Obviously. Otherwise, the show would cease to exist.

Dr. Grey is now the girl with the bomb.

Burke and the bomb squad badass burst in and try to keep everything under control.

Two interns and one paramedic try to keep a man alive even as the whole hospital is engulfed in a bomb scare.

Meredith and Cristina are doers, but they're watching in this particular shot.