Part 1: Sanctuary
Meredith takes a pregnancy test and it's positive! She tells Cristina immediately, but decides to tell Derek later that night.
Gary Clark, the man who blames Derek for his wife's death, arrives at the hospital. He asks where he can find the chief of surgery, but no one has time to help him. He corners Reed in a supply cabinet and when she brushes him off, we gasp as he shoots her in the head! And then he shoots Alex, who's just walking by. Alex manages to crawl to the elevator, even though he's bleeding severely.