Kate Rene Gleason

Well-connected Special Agent Emily Prentiss joins the team, as they take on two serial killers, who seem to be in competition with each other.

A gas tanker explodes on a highway, resulting in multiple injuries; Jo and Meredith try to help a frantic woman, whose child has a mysterious illness; Alex is forced to work with Jo's boyfriend.

Jane deflects Ziggy's questions about why they moved. Madeline hears her theatre production might get derailed, and is outraged over a slight from Renata. Celeste suggests she and Perry see a counsellor. Nathan and Ed hope to smooth out tensions between their wives.

Jack and Henderson wage an assault on the submarine, as Bierko prepares to launch an attack against LA. Chloe brings in someone from her past to aid her. Martha and Pierce enlist Novick's help in their plans to expose Logan.