Detectives from Chicago help search for two escaped killers.

Members of the Chicago PD and SVU pursue their suspect.

Investigating a child pornography site.

When a controversial misogynistic comic is accused of rape, Benson is happy to arrest him, but Barba feels the case is weak.

Virgin Skin. Despite the mystery surrounding Katie, life moves forward at the Firehouse.

Tonight's the Night. Firehouse 51 steps in when a blackout causes chaos in the community.

Malignant. Rhodes and Zanetti race to save a member of Firehouse 51; April's brother struggles during his first day at the hospital; a woman saved from a burning building leads to a bigger mystery.

Keep Your Mouth Shut. Despite his frustration, Severide remains hopeful that justice will be served.

Rhymes With Shout. A drive-by shooting hits close to home for Cruz and his brother.

Nobody Touches Anything. A routine house fire reveals evidence that demands the attention of the CPD - story arc crosses over into 'Chicago P.D

A Dark Day. An explosion at a Chicago hospital rocks the city.

Real Never Waits. A call to a boarding school leaves Severide questioning himself and Dawson's training is put to the test in the Season Finale.

Wow Me. Severide returns to work still reeling from a devastating loss.

A Rocket Blasting Off. With Keeler's whereabouts unknown, the men of Firehouse 51 are looked at as prime suspects.

Mistaken. The doctors treat those injured in a movie theater shooting; Natalie asks Daniel for help treating a teenager with an eating disorder; a patient surprises everyone.

Dawson and Casey deal with legal matters in hopes of remaining Louie's legal guardians. Severide continues in his efforts for a bone marrow procedure to help Anna, but when things don't go as planned, he finds himself slipping back into old habits.

Truck and squad are called to aid in a massive all-city response when an old, ill-equipped factory-turned live work space quickly turns into a firestorm, trapping countless unsuspecting victims. The dire situation quickly turns personal when it is discovered that one of Chicago PD's own has a family member at the scene.

Alternative Medicine. A young cancer patient struggles to tell her parents about her condition, Dr. Reese turns to Dr. Charles and Detective Lindsay for help with a troubled young man, a teen science geek and her friends impress Dr. Choi and Natalie.

Prisoner's Dilemma. Dr. Reese is contacted for help by a troubled teen in a psychiatric facility, Dr. Manning tries to help parents make a decision about their comatose daughter's surprise pregnancy, April begins to deal with repercussions from her personal life.

Inherent Bias. Goodwin reunites with her childhood sweetheart, Dr. Halstead gets lured into a concierge doctor app idea, Dr. Rhodes treats a woman with a heart infection against the advice of Dr. Charles, a former patient of Reese's reaches out for help.