Season 3 is remembered as one of the most emotional seasons of Chicago Fire because it dealt with the aftermath of Leslie Shay’s shocking death. The season also introduced Sylvie Brett, who would become one of the franchise’s most beloved characters. Another major highlight was Episode 19, “I Am the Apocalypse,” which served as the backdoor pilot for Chicago Med, helping expand the One Chicago universe even further. The season also featured major crossover events with Chicago P.D. and Law & Order: SVU, bringing together multiple Dick Wolf franchises.
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One of the most surprising facts about Season 3 is that Episode 19, “I Am the Apocalypse,” was actually created to introduce viewers to Chicago Med before the spin-off officially premiered. The season also marked Sylvie Brett’s first appearance, making it a turning point for Ambulance 61.
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