Severide and Patterson's differences reach a boiling point, while a visitor from Cruz's past asks for a favor.
Cast: Jesse Spencer, Taylor Kinney, Monica Raymund, Kara Killmer, David Eigenberg, Dora Madison, Yuri Sardarov, Joe Minoso, Christian Stolte, Eamonn Walker, Brian White, Steven R. McQueen, Randy Flagler, Tom Amandes, Carl Edwards