The fifth-year residents return for the first day of a year that will make or break their careers: Meredith faces the consequences of tampering with Derek's clinical trial and is terminated at the hospital; April tries to step up to the plate as Chief Resident in the wake of a giant sinkhole in the middle of Seattle; and Cristina and Owen are still at odds over their drastically different feelings for their unborn child.
CIA的反恐行动已经接近尾声，Joe（佐伊·索尔达娜 Zoe Saldana 饰）、Kaitlyn（妮可·基德曼 Nicole Kidman 饰）和Byron（迈克尔·凯利 Michael Kelly 饰）招募了一名新特工来潜入一个以前不为人知的威胁。随着来自各方的压力越来越大，Joe作为“母狮”计划的领导者，必须做出巨大的个人牺牲。
