CHANGE IS ON THE HORIZON AT 51 , BUT FORGETTING THE PAST CAN BE HARD –
- With everyone’s support, Dawson (Monica Raymund) makes final preparations to retake the fireman’s exam, but a call to the field may throw a major wrench into her plans.
- Elsewhere, Lt. Casey (Jesse Spencer) has an important matter to discuss with Antonio (guest star Jon Seda, "Chicago P.D.").
- Meanwhile, Lt. Severide (Taylor Kinney) and the firehouse welcome Rick Newhouse (guest star Edwin Hodge), the latest addition to the squad, Shay (Lauren German) gets an uninvited surprise guest and Chief Boden (Eamonn Walker) makes a bold move.
Charlie Barnett, David Eigenberg, Yuri Sardarov, Joe Minoso and Christian Stolte also star. Randy Flagler, Melissa Ponzio and Kenny Johnson also guest star.