Owen puts the residents through a rigorous trauma certification drill; Cristina is left alone to monitor an ill lung transplant patient.
Richard's 10,000th surgery is a liver transplant for two sisters; Derek and Lexie take on a case that had been declared inoperable; Teddy and Cristina try to swipe a case from Alex and Dr. McQueen; Meredith tries to choose a specialty.
The BAU investigates a case in Rossi's hometown that involves both his personal and professional lives.
The FBI team attempts to catch a killer who preys on families while they are supposed to be away on vacation.
As Magnum, Higgins and TC try to pull one over on a Customs agent to get Higgins a green card, armed gunmen suddenly storm the federal building and start taking hostages.