Melissa Center

The Wrong Guy. Severide steps in as ranking officer at 51. Kidd fights to save her Girls on Fire program. Cruz's family is threatened when someone from Javi's past resurfaces.

Ben worries that an innocent conversation with Derek could end up causing problems for Bailey; Cristina turns to Shane as tension with Meredith increases; April's upcoming wedding creates an uncomfortable situation for Stephanie and Jackson.

A betrayal intensifies the issues between Cristina and Meredith; Matthew and April make a decision about their relationship; Bailey faces difficulties with Ben's return.

April's visiting sisters get on her nerves; when Matthew and Jackson witness an accident, they must work together; Callie and Arizona work on their relationship.

Johnson looks to get her relationship with Masters back on track in the form of a new book deal while Masters does his best to find satisfaction elsewhere in his life. Betty and Helen ready themselves for the newest addition to their family while Art and Nancy discuss the consequences of their party.

Beth navigates her career path. Kate and Toby face unexpected issues. A run in with someone from his past gives Kevin pause.