Chicago Fire has been on air for 12 seasons on NBC, and without a doubt, one of the keys to its success is the drama-packed ...

After a decade of working together, it's no surprise that some colleagues develop friendships. That's the case with the ...

But here’s what really makes it special: Chicago Fire doesn’t rely on the same cast forever to stay good. The lineup has changed as often as the coffee supply, but the show keeps thriving.