Mills and the other members of the firehouse work to save the life of a car crash victim; Casey helps a strip club owner with a remodeling project.

While investigating a potential serial arsonist, the team finds evidence of a rape and attempted murder that is similar to a case SVU had ten years earlier.

Sgt. Voight convinces Lt. Casey to go undercover in order to find evidence of Jack Nesbitt's sketchy dealings; Otis and Severide have a disagreement.

Lt. Casey continues to look into Jack Nesbitt's suspicious activities; Chief Boden tries to reunite a firehouse that is divided from Rice's actions.

Lt. Casey gets into a dangerous situation while trying to destroy a trafficking ring that is run out of a strip club; Severide is shocked.

Everyone is on edge while Chief Boden waits for the results of an internal investigation; Lt. Severide tries to accept Capt. Patterson.

Tension is rising as the investigation finds new evidence that could ruin Chief Boden's career; Brett and Chili take action when they receive a call.

Firehouse 51 comes together to offer encouragement to a member of the team after a tragedy; Molly's closes and Hermann tries to figure out how to reopen it.

Boden proposes to have a wedding ceremony at the firehouse after a fire wrecks a local wedding, which upsets his boss, Chief Riddle.

Chief Boden's new neighbor asks him for assistance with something; the situation between Severide and Captain Patterson reaches a critical area.

Chief Boden gets into an argument with a neighbor; Severide's father pays him a surprise visit during his work probation; romance occurs at the gala.

The annual Andre The Giant Memorial Battle Royal is held; Wyatt Sicks face MFT in an eight-man street fight; the final parting shots before WrestleMania 42.

Jake draws a picture at school of a butterfly-tattooed-behind that he saw stamped on one of Charlie's lady friends, much to the chagrin of an infuriated Judith.

Charlie is duped into helping with Jake's school musical, but is helped by the popularity of one of his jingles; Judith surprises Alan with divorce papers.