"AN EVEN BIGGER SURPRISE"
10/12/2017 (10:00PM - 11:00PM) (Thursday) : CASEY FIND HIMSELF BUTTING HEADS WITH A NEW CHIEF - Lt. Casey (Jesse Spencer) gets off on the wrong foot with Sam Mullins (guest star John Gatins), a temporary Chief who is filling in for Boden (Eamonn Walker) at House 51 for the morning. When Casey later makes a risky move in an attempt to save a distraught man from jumping off a building, Mullins has a surprise that Casey does not expect. Mouch (Christian Stolte) flies in Cruz's (Joe Minoso) brother Leon (guest star Jeff Lima) as a birthday surprise, but the rest of the squad struggles to keep it a secret. Meanwhile, Brett (Kara Killmer) is caught off guard when she learns new information about her hometown friend Hope (guest start Eloise Mumford). Taylor Kinney, Monica Raymund, David Eigenberg, Miranda Rae Mayo and Yuri Sadarov also star. DuShon Brown and Randy Flagler also guest star.