Casey (Jesse Spencer) ends up in the middle of a dreadful situation in the upcoming episode 4, titled "Nobody Else Is Dying Today," of the fifth season of the American action-drama "Chicago Fire."

As part of Casey's Alderman's duties, he checks out a warehouse only to find himself in a dire situation he has not expected. Apparently, a forklift accidentally pierces a tank containing an extremely hazardous acid and causes to spill. Because of the accident, the father's and daughter's lives are in danger. Casey is left with no other choice but to do a dangerous response to lessen the damage.

Meanwhile, Dawson (Monica Raymund) and Brett (Kara Killmer) take care of the complaint from an elderly woman who is having some difficulty with a senior advocate. Mouch (Christian Stolte) and Brett, on the other hand, decide to keep on working on their secret joint project. Otis (Yuri Sardarov) reveals exciting news to the team, while he is taking time to prepare for an unusual expedition.

The promo trailer for "Chicago Fire" season 5 episode "Nobody Else Is Dying Today" shows a toxic explosion in one of the warehouses that Casey is tasked to check. He finds himself stuck with a teenage girl with no signs of help. Meanwhile, the teenage girl who got separated with her father, due to the explosion, believes that he is still going to come back and find them. However, it seems like Casey fears for the life of the girl's father.

Meanwhile, the previous episode, titled "Scorched Earth," saw Casey struggling in an urgent personal matter so he enlisted the help of Susan Weller (Lauren Stamile). Severide (Taylor Kinney), on the other hand, was granted the chance to travel with Travis Brenner (Scott Elrod), while Stella (Miranda Rae Mayo) was able to save a street kid from a tunnel fire.

"Chicago Fire" season 5 airs Tuesdays at 10 p.m. on NBC.