Aaron J. Nelson

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).

When the mutants devise a plan to take down Sentinel Services, Eclipse seeks out an old friend from his dark past in order to obtain some useful information. Meanwhile, Lauren and Andy attempt to combine their powers in order to help the group.