The most memorable guest appearances on Chicago Fire at Firehouse 51 range from real-life Mayor Rahm Emanuel and NASCAR's Carl Edwards to Rush band members and more.

CHICAGO FIRE — "Kicking Down Doors" Episode 1401 — Pictured: (l-r) Anthony Ferraris as Tony Ferraris, Taylor Kinney as Kelly Severide, Randy Flagler as Harold Capp — (Photo by: Peter Gordon/NBC via ...