WATCH THIS: WEDNESDAY
“Chicago Fire” (8 p.m., NBC): Severide (Taylor Kinney) confronts some serious personal adversity, but Kidd (Miranda Rae Mayo) stands by to help him in any way she can in a new episode called “What Will Define You.” Elsewhere, after she responds to a car accident involving a teenager and her sister, Brett (Kara Killmer) can’t shake the uneasy feeling that there’s a lot more to that incident than the medics are being told about.