Kate Mines

An escaped lion puts lives and relationships in danger; Lexie hears Mark talking about moving in with Julia; Teddy begins to come to terms with Henry's death; Callie asks Arizona about her past relationships.

Costumed patients create a challenge for the doctors; Derek and Ben work on a new surgical technique; Richard asks a resident to perform his next surgery, angering Bailey.

With Derek away, Meredith spends time with Amelia and finds out her true feelings about her time in Seattle. Bailey deals with the ramifications of her actions and Callie receives devastating news. Meanwhile, the residents panic after hearing that one of them will be fired.

A new doctor at Seattle Grace puts others on edge; Arizona struggles with phantom limb pain; Meredith is faced with her worst fear.

The crash of a small plane results in multiple casualties -- and brings back terrible memories, particularly for Meredith and Arizona; friction between Amelia and Owen becomes uncomfortable at work.

The doctors prepare for a superstorm headed for Seattle; as Owen becomes closer to Ethan, his desire to be a parent gets stronger; Meredith and her baby are put in danger.