Alex Weisman

In responding to a call Atwater (LaRoyce Hawkins) and Burgess (Marina Squerciati) discover a gunshot victim and the only witness is Lexi Olinsky (guest star Alina Taber). The shooting is tied to a Latin gang. To protect Olinsky's (Elias Koteas) daughter, Voight (Jason Beghe) takes the case from the Gang Unit. Ruzek (Patrick Flueger) pulls up Burgess to help with an undercover mission that he hopes will help solve the case.

After shots ring out at a movie theater, the Chicago Med doctors work to treat the victims while hospital administrator Sharon Goodwin (S. Epatha Merkerson) attempts to keep the press at bay. To treat a teenager with an eating disorder, Dr. Natalie Manning (Torrey DeVitto) enlists the help of Dr. Daniel Charles (Oliver Platt), but his unorthodox methods rub Natalie and the teenage girl's mother the wrong way. Meanwhile, Nurse April Sexton (Yaya DaCosta), Dr. Will Halstead (Nick Gehlfuss) and Dr. Ethan Choi (Brian Tee) treat a racist patient whose strange form of bigotry surprises them all.

A member of the Firehouse family clings to life and members of the Chicago Med staff discover a highly unusual parallel between cases - a three-part story arc crosses over into "Chicago Fire" and concludes the following night on "Chicago P.D. Following a knife attack, a member of the team lies in peril and their condition takes a sudden turn for the worse, leaving Dr. Connor Rhodes (Colin Donnell) and Dr. Toni Zanetti (guest star Julie Berman) scrambling to race against the clock. Word quickly spreads that some of Connor's fellow doctors feel he should have operated sooner, causing tension at the hospital. Dr. Natalie Manning (Torrey DeVitto) makes preparations for her pregnancy and Nurse April Sexton's (Yaya DaCosta) brother (guest star Roland Buck III) struggles through his first day at the hospital. Meanwhile, members of the Chicago P.D. Intelligence Unit help investigate whether the case of a women clinging to life after Firehouse 51 pulled her out of a burning building is attempted suicide or murder. As the investigation deepens, a surprising parallel to other patients surfaces.

Two airplane stowaways are brought into the hospital after suffering major injuries from the travel, prompting Sharon Goodwin (S. Epatha Merkerson) to receive a visit from the Department of Homeland Security regarding the undocumented immigrants. Cornelius Rhodes (guest star DW Moffett), the wealthy father of Dr. Connor Rhodes (Colin Donnell), is honored after making a big donation to the hospital for a new psych ward, forcing dark family secrets to the surface. Dr. Natalie Manning's (Torrey De Vitto) big day arrives and Dr. Will Halstead's (Nick Gehlfuss) good intentions to help are misconstrued by her mother-in-law, Helen (guest star Annie Potts). Meanwhile, Dr. Sarah Reese (Rachel DiPillo) asks Dr. Charles (Oliver Platt) for advice on how to deliver heartbreaking news to a young boy while also warning his family about the possibility that their other son may also have the same life-threatening disease.

When a tanker collides into a commuter train that subsequently crashes into a warehouse, the firehouse is called to the horrific scene that tests everyone to the limits as life and death hangs in the balance. With the ultimatum in place for him or the firehouse, Boden (Eamonn Walker) is tasked with making life-changing decisions regarding his future. Severide (Taylor Kinney) learns more about Katie (guest star Brittany Curran), the young woman he saw with his father (guest star Treat Williams). Meanwhile, Shay (Lauren German) and Dawson (Monica Raymund) are still at odds and Casey's (Jesse Spencer) responsibility of being a surrogate father takes a sharp turn.