In the season finale of Chicago Fire, tensions reach their peak as Severide risks his career to support a fellow firefighter. Meanwhile, Kidd finds herself entangled in the complexities of Natalie's relationship with her sister, navigating personal and professional challenges. Herrmann is also gearing up to tackle a significant career milestone as he prepares for the Chief test. This episode promises an intense mix of personal drama and high-stakes action, keeping viewers on the edge of their seats.