: Following a severe head injury in the previous episode, Captain Casey struggles with headaches and blurred vision. While he tries to hide it, Gallo notices and confronts him about the danger he poses to the team. Eventually, Casey seeks informal advice from Dr. Will Halstead of Chicago Med , who urges him to see a neurologist immediately.
: Hanako Greensmith (Violet Mikami), Alberto Rosende (Blake Gallo), and Nick Gehlfuss (Dr. Will Halstead). Chicago Fire Review: One Crazy Shift (Season 9 Episode 10) [S9E10] One Crazy Shift
: A series of suspicious laundry service fires prompts Casey and Severide to investigate. They discover a combustible chemical was accidentally mixed into a commercial detergent, which had already been distributed to hundreds of Chicago businesses. The team races to find an unaccounted-for delivery truck that is fuming and nearly ready to explode. : Following a severe head injury in the
In Season 9, Episode 10, " One Crazy Shift " (originally aired March 31, 2021), the crew at Firehouse 51 deals with a chemical fire investigation, leadership tension, and a comedic subplot involving the fire department's band. Plot Summary Will Halstead of Chicago Med , who urges
: Mouch dreams of joining the CFD "Pipes and Drums" band but struggles with the audition. Despite failing because he cannot read music, he finds a small victory when the band decides to use his "sob story" video as a promotional tool. Cast & Guest Appearances
: Jesse Spencer (Matthew Casey), Taylor Kinney (Kelly Severide), Kara Killmer (Sylvie Brett), Christian Stolte (Mouch), and Eamonn Walker (Wallace Boden).
: After Gianna Mackey's departure, Sylvie Brett searches for a permanent paramedic partner. Though she initially thinks Violet Mikami is unavailable, she eventually asks her to join 51 permanently.