The departure of one cast member typically brings with it the arrival of someone new, to help shake things up, particularly if the show has been on the air for a long time. In the case of "Chicago Fire", the show has recently brought on Brett Dalton to portray Lieutenant Jason Pelham (via One Chicago Center). Also joining the show for season 10 is Ynez Spencer, who would replace Gallo (Alberto Rosendale) as the rookie of Firehouse 51.

There are also some changes happening behind the camera, too, with executive producer Andrea Newman joining current showrunner Derek Haas as his co-showrunner (via Deadline). "Andrea's voice is embedded in the soul of 'Chicago Fire,'" Haas shared. "She's an immensely gifted storyteller, manager, colleague and friend. No one in Hollywood works harder or cares more about making great television than she."

And fear not "Chicago Fire" fans: The door is always open for Captain Casey to return (via USA Today). "There is the potential for me to come back. I still am in Chicago right now," Spencer shared. "My home here with my wife is in Chicago, so I'm still going to be here, but I'm just stepping back for right now."