•Jesse Spencer | played | Lieutenant Matthew Casey (S01-) (92Eps.) |
•Taylor Kinney | played | Lieutenant Kelly Severide (S01-) (92Eps.) |
•Monica Raymund | played | Firefighter Gabriela Dawson (Paramedic S01-S03E03; Firefighter S03E04-) (93Eps.) |
•Kara Killmer | played | Paramedic Sylvie Brett (S03E02-; recurring previously) (45Eps.) |
•David Eigenberg | played | Firefighter Christopher Herrmann (S01-) (90Eps.) |
•Yuri Sardarov | played | Firefighter Brian "Otis" Zvonecek (S02-; recurring previously) (69Eps.) |
•Joe Minoso | played | Firefighter Joe Cruz (S02-; recurring previously) (69Eps.) |
•Christian Stolte | played | Firefighter Randy "Mouch" McHolland (S02-; recurring previously) (69Eps.) |
•Steven R. McQueen | played | Paramedic Jimmy Borrelli (Firefighter S04E07-S04E14; Paramedic S04E15-; recurring previously) (17Eps.) |
•Eamonn Walker | played | Battalion Chief Wallace Boden (S01-) (91Eps.) |
•Teri Reeves | played | Dr. Hallie Thomas (S01E01-S01E07; recurring otherwise) (7Eps.) |
•Lauren German | played | Paramedic Leslie Shay (S01-S02; recurring otherwise) (46Eps.) |
•Charlie Barnett (2) | played | Paramedic Peter Mills (Firefighter S01-S03E03; Paramedic S03E04-S03E20) (66Eps.) |
•Dora Madison Burge | played | Paramedic Jessica "Chili" Chilton (S04E01-S04E14; recurring previously) (14Eps.) |