6. Season 8
It’s the filler! Season 8 has some all-time filler episodes and storylines, like the one where Kidd and Chief Boden (Eamonn Walker) go on a diet or Casey taking his ex-wife to charity event. It’s a shame too, because the highs of season 8 are among the most memorable episodes that show has to offer.
There’s the death of Otis (Yuri Sardarov) is one of the most heartbreaking episodes in all of Chicago Fire. It’s masterfully written and acted, and no matter how many times you watch it, it tugs at the heartstrings. This season premiere, and the episodes that explore the fallout of Otis’ death, are peak Chicago Fire.