The Firehouse 51 Lineup: Everything To Know About The Chicago Fire Cast, New Chief, And 2025 Crossover Secrets

The Chicago Fire cast remains one of the most beloved and enduring ensembles in television history, anchoring the massive One Chicago franchise. As of December 18, 2025, the crew of Firehouse 51 continues to face life-and-death stakes, but the biggest dramas this season are happening inside the station. With a new, potentially controversial Battalion Chief taking the reins and a fan-favorite paramedic getting a major promotion, the lineup is shifting in ways that will redefine the series for the current and upcoming seasons. The freshest news centers on the dynamic between the veterans and the new leadership, setting the stage for an explosive three-part crossover event with Chicago P.D. and Chicago Med in early 2025.

This article dives deep into the current main cast, their real-life profiles, the dramatic character arcs of Lieutenant Kelly Severide and Lieutenant Stella Kidd, and the shocking details surrounding the new Chief Dom Pascal. Prepare for a full rundown of the heroes—and the new faces—who make up the backbone of the Chicago Fire Department.

The Current Firehouse 51 Main Cast: A Complete Biography Profile

The heart of Chicago Fire lies with the dedicated first responders of Firehouse 51. Here is a look at the core ensemble for the current season, including their key biographical facts and career highlights outside of the One Chicago universe.

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• Taylor Kinney as Lieutenant Kelly Severide (Squad 3)
  • Born: July 15, 1981 (Lancaster, Pennsylvania)
  • Career Highlights: Kinney is a model and actor best known for his long-running role as Severide since 2012. Before Chicago Fire, he gained recognition as Mason Lockwood on The Vampire Diaries and starred in films like Zero Dark Thirty and The Other Woman.
  • Personal Life Update: Kinney married model Ashley Cruger in 2024.
• Miranda Rae Mayo as Lieutenant Stella Kidd (Truck 81)
  • Born: August 14, 1990 (Fresno, California)
  • Career Highlights: Mayo joined the cast in Season 4 and quickly became a fan favorite, eventually marrying Severide. Her previous notable roles include Lacey Briggs on Blood & Oil and appearances on Pretty Little Liars and Days of Our Lives.
• David Eigenberg as Lieutenant Christopher Herrmann (Engine 51)
  • Born: May 17, 1964 (New York, U.S.)
  • Career Highlights: A veteran actor, Eigenberg is instantly recognizable for his iconic role as Steve Brady, the on-again, off-again love interest of Miranda Hobbes, in the HBO series Sex and the City and its revival, And Just Like That.... He has been with Chicago Fire since the pilot.
• Joe Miñoso as Firefighter Joe Cruz (Squad 3)
  • Born: September 25, 1978 (Bronx, New York)
  • Career Highlights: Miñoso is a theater and television actor who has been a main cast member since Season 2. His early career included roles in shows like Prison Break. His character, Joe Cruz, is known for inventing the "Slamigan" rescue tool.
• Christian Stolte as Firefighter Randy "Mouch" McHolland (Truck 81)
  • Born: October 16, 1962 (St. Louis, Missouri)
  • Career Highlights: Stolte is a Chicago-based actor known for his work in films like The Public Eye and previous television appearances, including a recurring role on Prison Break. His character, Mouch, is a beloved veteran of the CFD and married to Chicago P.D.'s Trudy Platt.

Major Cast Changes and Character Shocks for the Current Season

The departure of a beloved character—Chief Wallace Boden (Eamonn Walker)—left a massive void at Firehouse 51. The current season has introduced two major casting moves that are driving the primary dramatic tension, specifically the arrival of a new Battalion Chief and the permanent addition of a dynamic paramedic.

The Arrival of Chief Dom Pascal: A New Era of Suspicion

The most significant new face is Dermot Mulroney, who joins the cast as the new Battalion Chief, Dominick "Dom" Pascal. Mulroney, a veteran actor known for films like My Best Friend's Wedding, steps into the series-regular role, replacing Boden.

Chief Pascal’s arrival has been anything but smooth. Unlike the paternal, respected leadership of Boden, Pascal is immediately shrouded in suspicion. The Season 13 premiere saw a palpable tension as both Lieutenant Severide and Lieutenant Kidd kept a "watchful eye" on their new boss, sensing something off about his command style and decisions.

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The curiosity-piquing plot point came to a head in the Season 13 finale, where Chief Pascal was reportedly brought in for questioning following a suspicious car accident that brought the Office of Fire Investigation (OFI) to Firehouse 51. This storyline suggests the new Chief might not just be a tough leader, but a figure with a murky past or even a hand in internal corruption, forcing Severide to put his own job on the line to protect his crew. The drama surrounding Chief Pascal is the central conflict, fueling the narrative and testing the loyalty of the entire Truck 81 and Squad 3 teams.

Jocelyn Hudon's Promotion: Paramedic Lyla Novak Joins the Ranks

In a move that delights fans of the Ambulance 61 crew, actress Jocelyn Hudon, who plays Paramedic Lyla Novak, has been promoted to a series regular for the current season.

Hudon’s character, Novak, quickly became a standout after her introduction, known for her sharp wit and no-nonsense approach to emergency calls. Her promotion signifies a renewed focus on the medical side of Firehouse 51, ensuring that the paramedic team remains a central and dynamic part of the show. Her permanent status allows for deeper exploration of her personal life and professional ambition, potentially setting her up for a future role as a Paramedic Field Chief or a major player in the One Chicago universe, much like her predecessors.

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The Future of Stellaride and The Explosive 2025 Crossover

The relationship between Kelly Severide and Stella Kidd, affectionately known as "Stellaride," continues to be the emotional anchor of the series. While they have successfully navigated marriage and career challenges, the current season is testing their partnership through professional strain and high-stakes investigations.

Lieutenant Kidd is shown navigating complex personal relationships while also bonding with others at the firehouse, while Lieutenant Severide has been relentlessly pursuing an investigation into a suspicious trucking company. This storyline not only highlights his expertise in OFI investigations but also creates conflict with the new, possibly corrupt, Chief Pascal. The combination of their joint investigations and Severide's willingness to risk his career for the truth will determine the future of their relationship and their standing within the CFD.

The Must-Watch Three-Part One Chicago Crossover Event

For fans of the entire Dick Wolf-produced franchise, the biggest news is the confirmed return of the epic, three-part One Chicago Crossover event, scheduled to air on Wednesday, January 29, 2025.

This massive television event will kick off with Chicago Fire and continue through Chicago Med and Chicago P.D., weaving a gripping, three-hour narrative that puts fan-favorite characters across all three shows in danger. The crossover is a crucial element of the franchise’s topical authority, bringing together characters like Kelly Severide and Stella Kidd with familiar faces such as Sergeant Hank Voight and Detective Jay Halstead from Chicago P.D., and Dr. Hannah Asher from Chicago Med.

These crossovers are a powerhouse for the network, often delivering A+ ratings and intense storylines that have long-lasting effects on the characters' lives. The 2025 event is expected to resurrect the tradition of high-stakes, cross-show action, potentially involving a city-wide threat that requires the combined efforts of Firehouse 51, the *21st District*, and the doctors at *Gaffney Chicago Medical Center*. This highly anticipated event is the perfect showcase for the current cast and a must-watch for anyone following the latest developments in the Chicago Fire narrative.

The current season of Chicago Fire is packed with new challenges, from the internal politics of Chief Dom Pascal to the high-pressure situations handled by Squad 3, Truck 81, and Ambulance 61. The fresh cast additions and the looming threat of the new Chief ensure that the series is as intense and emotionally resonant as ever, keeping the One Chicago flame burning bright.