Professional Courtesy: [s1e3]

: Kelly Severide learns he has a fractured vertebra but chooses to hide the severity of his injury and use painkillers to keep working.

: Candidate Peter Mills struggles with the choice between his commitment to the fire department and helping his mother with the family restaurant. Significant Moments

In the Chicago Fire episode (Season 1, Episode 3), the "deep feature" is the introduction of Hank Voight . This episode serves as the origin point for the character who would eventually lead the spin-off series, Chicago P.D. . [S1E3] Professional Courtesy

: Casey refuses to be intimidated by Voight , officially filing the report and setting off a multi-episode rivalry that defined the show's first season.

If you'd like to dive deeper into the Chicago franchise, I can provide: on the Casey vs. Voight rivalry resolution Character arcs for Severide or Mills in Season 1 Viewing order for One Chicago crossover events : Kelly Severide learns he has a fractured

: Despite the external threats from Voight , the crew of Firehouse 51 pools their money—originally intended for a new TV—to build a wheelchair ramp for the paralyzed victim.

: Characterized as a "dirty cop" from the start, Voight uses threats and intimidation to protect his son, Justin. This episode serves as the origin point for

"Chicago Fire" Professional Courtesy (TV Episode 2012) - IMDb