Chicago_fire_1x20 (2025)

: Gabriela Dawson and Matthew Casey grow closer as the opening of Molly's Pub approaches, but their progress is interrupted by the unexpected return of Casey’s ex-fiancée, Hallie Thomas . Key Guest Stars Chicago Fire: Season 1, Episode 20 | Cast and Crew

: Peter Mills' desire to join the Rescue Squad causes resentment among some of his colleagues at Firehouse 51, even though Kelly Severide supports his ambition . Chicago_fire_1x20

: Cindy Herrmann (Christopher Herrmann's wife) experiences pregnancy complications while her husband is away. Leslie Shay steps in to help her through the crisis . : Gabriela Dawson and Matthew Casey grow closer

In season 1, episode 20, titled " Ambition " (originally aired April 3, 2013), the episode features several key storylines and guest stars : Episode Highlights Leslie Shay steps in to help her through the crisis