'Chicago Fire' fall finale will lead to the ‘biggest accident’ ever, and fans will be ‘furious’

Fans should expect to get their hearts broken after watching the final half of the season for “Chicago Fire,” according to showrunner Derek Haas.

For the NBC show’s final 2018 episode, Haas told TV Guide that viewers would witness the most gut-wrenching tragedy as of late.

He said, "The episode is going to end in such a way where most of our viewers are gonna be furious with me.”

A sneak peek of the episode entitled “Always a Catch,” the show will air a tragic car crash that will significantly impact those involved with Firehouse 51.

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Haas claimed the scenes on the episode will feature the "biggest accident we've ever done on the show."

The producer didn’t disclose much, but he shared that Taylor Kinney’s character, Kelly Severide, will struggle a lot following his father’s passing.

Haas said, "Sometimes when he hits these emotional tragedies in his life, he tends to wreck things, and I think you're gonna see the manifestations of that.”

He also revealed that Severide’s struggles would affect his relationship with Stella played by Miranda Rae Mayo.

To give ease for the fans, a budding relationship will be highlighted amid the heavy scenes on the episode. Matthew Casey – Jesse Spencer’s character – and Naomi Graham – Kate Villanova’s role – may have shared a spark or two with a kiss.

Although, Haas suggested that fans shouldn’t be too excited about it.

"I wouldn't consider this his next big relationship," he said, but later on added, "I don't think you're gonna be disappointed in what's coming for Casey in the second half of the season."

The last episode of “Chicago Fire” this 2018 will air on December 5 at 9 p.m. EST on NBC.

The action-drama series started on October 10, 2012. The show features firefighters and paramedics at Firehouse 51. Other actors on the show include Monica Raymund, Eamonn Walker, and David Eigenberg.

In 2017, the show was nominated for two People’s Choice Awards under the “Favorite Network TV Drama” category.