S5, E22: A dangerous warehouse fire puts truck and squad at risk. Tensions are high for Dawson (Monica Raymund) and Casey (Jesse Spencer) when Dawson's father (guest star Daniel Zacapa) overstays his welcome at their home. Meanwhile, Casey continues to fight for his first responders bill, Mouch (Christian Stolte) makes a serious decision regarding his future and Herrmann (David Eigenberg) goes to tremendous lengths to make a young boy smile.