Alex Weisman

Changing roles and colleagues prove a test for the doctors as Rhodes and Choi face new environments and problems.

Rhodes and Zanetti race to save a member of Firehouse 51, April's brother struggles during his first day at the hospital, and a woman saved from a burning building leads to a bigger mystery.

A mass shooting at a cinema inundates the hospital with gunshot victims, including the shooter. Dr Rhodes faces a crisis of conscience.

The firehouse crew go to the scene of a railroad accident; Boden must make a big decision about his future; Severide learns more about the woman he saw with his father; Shay and Dawson continue to butt heads.

Dr Rhodes tends to two injured airplane stowaways, but their treatment becomes complicated when the Department of Homeland Security arrives.

New-to-the-crew Sylvie shines as the crew answer three dramatic call-outs; Casey asks Newhouse to help dig up dirt on his sister's husband.