Gene Weygandt

Severide must leave Lindsay and the Intelligence Unit to find Katie; Blackhawk players Brent Seabrook and Duncan Keith give Shay a tip; Casey gets more information about his head injuries; Dawson works to pass the physical test.

Detective Lindsay calls in suspects in the disappearance of Katie's kidnapper; Jones struggles to fit in; Herrmann celebrates his 20th wedding anniversary.

Dawson and Casey's relationship is tested as the team responds to a truck leaking hydrochloric acid in a busy intersection; Severide learns about Brittany's past; Mouch has dating troubles.

The fate of the hospital rests on the vote of an incapacitated board member. Archer helps a mother with a rare stem cell disease while Hannah treats the woman’s pregnant daughter. Charles encounters a schizophrenic patient with a serious hearing impairment.

Surprised Dawson receives a suicide note; Severide looks into Bloom's dark past; Shay and Casey search for a life-changing item.

Lt. Severide tries to help a firefighter from Denver struggling with addiction; Shay and Dawson plan a girls weekend at a cabin in the woods; Mills and the guys update Mouch's online dating profile.