David Eigenberg

The Chicago Fire stars had a blast on set. 

The third entry in the One Chicago universe started off with such a bang — and many of your current faves.

Here's what Firehouse 51 looked like at the very beginning. 

Here's what happened with the little boy Gabby Dawson and Matthew Casey tried to adopt. 

Chi-Hards still carry a torch for these beloved characters who were taken before their times.

Here's what the Chicago Fire actor saw — and how it changed him. 

He showed up to support the brave team.

The rookie's fellow firefighters rallied around him at his most vulnerable moment — which is just what happened to this Chicago Fire character.

Revisit this fascinating character's story arc, from a Colorado prison to Firehouse 51. 

Monica Raymund's Gabby Dawson was a complex, beloved Chicago hero.