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Chicago Fire (NBC)
Premieres: Tuesday, Sept. 24, 10/9c
Where We Left Off: Casey struggled in the wake of Hallie's sudden death. After Shay's latest attempt to get pregnant was unsuccessful, she and Severide were shocked and devastated to find out that Renee was expecting.
What's Next: Although Sarah Shahi is joining Person of Interest full-time, Renee will pop back up at the beginning of the season. However, the pregnancy will create new tension between Severide and Shay, who starts apartment hunting. Meanwhile, after taking some time off to try to deal with his loss, Casey will find solace in a group of children he takes under his wing. Plus: Look for new faces in the firehouse this season, including a cost-cutting suit who wants to shut down three firehouses and a former military man-turned-firefighter who will spy on Firehouse 51.