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The members of Firehouse 51 and the Austin firehouse clash when trucks collide on the way to a call; Boden comes up with a plan to get Dawson her badge; Mills faces his past and future; the Molly's group hits a speed bump starting the food truck.

Detectives probe what looks like the ritualistic sacrifice of a 7-year-old Nigerian boy and uncover a slave-smuggling ring.

Family members become murder suspects when DNA tests on the body of a 16-year-old girl reveal evidence of incest.

A child dies in the emergency room after passing out during a prayer vigil at a late-night church service.

After photos of Casey and Severide jumping off the roof during a heroic rescue make the front page of the newspaper, Boden unwillingly agrees to have the photographer chronicle a day at the firehouse.

After responding to a car accident, Casey and Dawson become skeptical when a domineering husband continues to answer for his injured wife; Cruz is frustrated with Herrmann and Mouch; Kidd uncovers something meaningful to Severide.

Otis and Kidd's lives are put in jeopardy when there's gunfire inside a house; Dawson comforts Brett during an especially trying time; Casey begins to notice that romance might be going on within the firehouse.

The crew struggles to come to terms with an injury to one of their own; a temporary replacement must be dealt with; Boden ponders some interesting news; Kidd has a hard time keeping a secret.

Boden has a lapse in judgment in the aftermath of rescuing a young boy; Kidd struggles to win the approval of Severide's mom after a surprise visit; Otis takes on new responsibilities at the firehouse.

When the FBI takes over the firehouse for an undercover mission, Casey and Severide volunteer to assist with the investigation; Kidd attempts to help Severide come to terms with recent developments he's been managing.

The team responds to a residential fire at a property belonging to a drug cartel; a hefty amount of money is missing from the crime scene; Kidd makes a big decision.

From O2 Arena in Prague, Czech Republic.

After saving a girl from a car accident, Boden and Severide receive a surprise package; Brett struggles to keep quiet about Cruz reacquainting with his now-married high school sweetheart; a crisis brings Bria back into Dawson's life.

Lt. Severide is shocked when Rene Royce resurfaces; Casey comes up with a plan to help Chief Boden in his latest pursuit; Kidd regrets a decision she made regarding Severide; Herrmann clashes with Lt. Colannino over their son's basketball team.

Boden takes a big step in the pursuit of a major career decision; Kidd becomes increasingly distrustful of Renee's motives with Severide; Herrmann has trouble bouncing back after a tragedy.

Boden's chances for a promotion are met with potential complications; Dawson and Casey don't see eye to eye on an important decision; Kidd finds herself struggling to find time with Severide; Brett and Dawson respond to a tough call.

Reeling from Dawson's continued absence, Casey makes a rash move during a rescue, while Brett struggles with a series of replacement partners; meanwhile, Boden faces scrutiny from Commissioner Grissom, who sends his deputy to monitor Firehouse 51.

Severide investigates a victim's motives after rescuing him and his child from a car accident; Boden clashes with Gorsch over appointing a new lieutenant; Mouch reaches out to a fellow firefighter; Cruz discovers he has a new admirer.

Herrmann faces hazing in his new role as lieutenant; Foster suspects a young gymnast's injury is more than meets the eye; Severide is jealous of Kidd's best friend; Casey and Boden turn to P.D. after treating two victims who have similar injuries.

Casey helps a reporter uncover the truth behind a trailer park fire; Boden attempts to make peace with Grissom; Hermann, Otis and Kidd take action when Molly's receives a bad Yelp review; Severide reaches out to his father for a favor.