Guest Stars Eamonn Walker as Battalion Chief Wallace Boden Taylor Kinney as Lieutenant Kelly Severide Jesse Spencer as Matthew Casey Sydney Tamiia Poitier as Mia Sumner Joe Miñoso as Firefighter Joe Cruz Randy Flagler as Firefighter Harold Capp Aimée Laurence as Zoe Silver Charlie Barnett as Firefighter Peter Mills Jay Karnes as FBI Special Agent William Graff Lauren German as Paramedic Leslie Shay Amanda Righetti as Dr. Holly Thelan Dylan Baker as Doctor David Arata Avi Lake as Imogene Co Starring Erik Hellman as Dr. Alec Willhite Anthony Ferraris as Squad 3 Driver Tony Ferraris Sean Michael Sullivan as Bomb Squad Tech Sullivan Brett Schneider as Patrick Vaughn Erin Charchut as Holly's Step-Mom David Goodloe as Billy Barret Walz as Ear Buds James Krag as Holly's Dad Leena Kurishingal as O.R. Nurse Matt Schwader as Ted Powell Matt Singletary as Prison Guard #1 Richard Pickren as Frank Powell Summer Smart as Greta Tanya Thai McBride as Trauma Nurse Antonio St. James as Prison Guard #2