On next week's all new episode of NBC's CHICAGO FIRE, titled "Leaders Lead," a frustrated Severide (Taylor Kinney), turns to an unlikely ally to resolve his current dilemma. Casey (Jesse Spencer) begins to find satisfaction in his personal life, while Mills (Charlie Barnett) and Dawson (Monica Raymund) face personal challenges. Meanwhile, the squad is called to the scene of a harrowing apartment building collapse. Lauren German, David Eigenberg and Eamonn Walker also star.