'Chicago Fire' Season 3 Finale Spoilers: Casey Goes Undercover, Boden Deals With Fire Outbreak at Firehouse 51

NBC's hit TV drama series "Chicago Fire" is now ready to kick off its Season 3 finale and as what spoiler reports suggested, fans should better brace themselves for the shocking events that are expected to take place.

Series creator Matt Olmstead implied that the current season will wrap up in a way that fans won't be expecting.

"There's a major cliff-hanger in terms of the ramifications that land on Casey [Jesse Spencer] for being involved or cooperating with the cops," he told TV Guide.

A synopsis for the upcoming episode titled "Spartacus" was shared on Hollywood Hills and it says that Lt. Casey will be risking his life by working with "Chicago P.D." Voight (Jason Beghe) to take on the task of investigating Jack Nesbitt's shady dealings.

In a sneak peek shared by The Hollywood Reporter, it featured the two meeting with Chief Boden (Eamonn Walker) to discuss the prospect of Casey going undercover in order to get some intel on Nesbitt's suspected human trafficking organization.

"Jack Nesbitt gives all firefighters a bad name," Casey tells a reluctant Boden in the video. "If I can help, I want to help."

Another exciting, or rather, interesting aspect in the show's finale is the reported fire incident which will engulf Firehouse 51. The blaze, which quickly gets out of control, will put Boden and his team in a desperate situation to save their own lives.

The promo video shared via Carter Matt featured Boden taking control of the chaos, giving instructions to Severide and other firefighters present.