A lion breaks loose in Seattle, leaving a couples lives and relationship at risk; Lexie overhears Marks discussion about moving in with Julia; Teddy begins to take steps towards coming to terms with Henrys death; Callie grills Arizona on her past lovers; and Alex requests to be taken off Morgans preemie case when she becomes too dependent on him. Meanwhile, Meredith tries to be a support for Cristina as the tension between her and Owen hits a boiling point.