: 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.
: Characterized as a "dirty cop" from the start, Voight uses threats and intimidation to protect his son, Justin. [S1E3] Professional Courtesy
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 : Casey refuses to be intimidated by Voight
: Candidate Peter Mills struggles with the choice between his commitment to the fire department and helping his mother with the family restaurant. Significant Moments [S1E3] Professional Courtesy