[s1e3] Professional Courtesy Here

: 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.

: 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. [S1E3] Professional Courtesy

"Chicago Fire" Professional Courtesy (TV Episode 2012) - IMDb : Casey refuses to be intimidated by Voight

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. . Chicago P.D. .