S. Epatha Merkerson

Despite non-stop action, the holiday season keeps these Windy City first responders merry and bright.

Several beloved actors on the series got their starts as guest stars in earlier seasons or on other shows.

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

Long-time fans know the many of the actors most associated with the show weren't there from the beginning.

Gaffney Chicago Medical Center went through so much this year.