'Chicago Fire' Boss Says There Will Be 'Cast Shake-Ups' in Season 9 (Exclusive)

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Warning: Do not proceed if you have not watched Wednesday's season finale of Chicago Fire. You are entering spoiler territory.

If Chicago Fire didn't feel like a finale, it's because it wasn't the intended season eight ending. 

"We were five days into shooting [Wednesday's] episode when we found out it would be our last for the season. Luckily, we usually have a cliffhanger or two in an episode, so this one worked out," executive producer Derek Haas tells ET of how the coronavirus outbreak has disrupted plans. Haas hinted that the three remaining unproduced episodes of the season will likely "transfer" over to the beginning of season nine. 

With the season cut short due to the coronavirus pandemic, ET sent off our biggest finale questions to Haas over email about abandoning plans for the original Chicago Fire finale, why there won't be a Zoom episode, "turning up the heat" on Brett and Casey's relationship and big changes ahead in season nine.

ET: With Chicago Fire wrapped earlier than expected, how much did you have to tweak to ensure that Wednesday’s episode felt like a natural finale?

Derek Haas: We weren’t able to do anything. We were five days into shooting that episode when we found out it would be our last for the season. Luckily, we usually have a cliffhanger or two in an episode so this one worked out.  

What were the early plans for the remaining episodes you weren’t able to produce?

I think we can transfer storylines we were going to begin in the last three episodes and adapt them to be season-starting storylines rather than season-ending ones.