Dawson attempts to help her brother Antonio unravel the details of his drugs-and-gang investigation, and goes behind his back in turning to an unlikely source for assistance. Casey and his mother, Nancy struggle with their new relationship. Meanwhile... (more), as a favor to Lieutenant Whaley, Severide visits someone important from his past, while Herrmann and Otis learn some hard truths about their "silent partner" in the bar.

Brady Tutton, Elizabeth Murphy, Eric Lane, Jeff Dumas, Jennie Moreau, Jesse Marx, Molly Pan, Morocco Omari, Rachel Cerda, Randy Flagler, Ruby Kaye, Thomas Gaitsch, William Dick, William Smillie