Liz E. Morgan

Mills (Charlie Barnett) and Brett (Kara Kilmer) race to recover a missing teenager and are left stranded in the unforgiving elements, while the rest of Firehouse 51 babysits an abandoned newborn. Meanwhile, Lt. Severide (Taylor Kinney) receives an interesting job proposal and Chief Boden (Eamonn Walker) finds himself at odds with his father (guest star Richard Roundtree) over his treatment and the planning of a big party in his honor.

Interim Chief Pat Pridgen (guest star Matthew Del Negro) is brought over to temporarily fill in for Boden (Eamonn Walker), who is left to tend to his personal affairs. When tension is sparked as the result of his derisive leadership, the absence of Chief Boden (Eamonn Walker) becomes all too apparent. Meanwhile, Lieutenant Severide (Taylor Kinney) must deal with a most unwelcome addition to his squad, Brett (Kara Killmer) gets closer to a girl she previously rescued and Casey (Jesse Spencer) starts seeing a new woman, Beth (guest star Bree Williamson), but interesting complications quickly unfold.

Daryl, Abraham, and Sasha run into multiple obstacles, including a new threat, while trying to return to Alexandria after a mission.