John Seda

Casey and Dawson apply for permanent adoption of Louie, but quickly discover a hurdle. Firefighter-turned-medical student Jeff Clarke approaches Lt. Severide with an interesting proposition. With hopes of reinvigorating business at the bar, Otis convinces a skeptical Herrmann to throw a bash.

Members of Firehouse 51 are less than thrilled when Captain Patterson (guest star Brian White) steps in as replacement for Chief Boden (Eamonn Walker) while he deals with clearing his good name. Severide (Taylor Kinney) learns of the potential whereabouts of Serena (guest star Ilfenesh Hadera.)

A gun battle in the streets yields casualties; Bobby tries to convince his brother to turn himself in.

Walker and the Rangers must protect a deaf girl from the mob when she accidentally witnesses the murder of an undercover police officer; guest Joe Penny.