Allison Latta

Events force Lieutenant Casey to team up with the Intelligence Unit, now run by Voight, who doesn’t appear to have changed his crooked ways after his stint in prison. Shay's excitement at the prospect of becoming a parent grows, while Mills and Dawson face some personal challenges. Meanwhile, the house comes together to support the opening of Molly's.

While working to track down a bombing suspect, Voight (guest star Jason Beghe) and Antonio (guest star Jon Seda) meet with Chief Boden (Eamonn Walker), who unwillingly agrees to let Dawson (Monica Raymund) and Brett (Kara Killmer) go undercover. As the investigation continues, Boden, Casey (Jesse Spencer) and Severide (Taylor Kinney) lend their skilled expertise in the investigation. Elsewhere, Kidd (Miranda Rae Mayo) and Zach's (guest star Daniel Di Tomasso) relationship hits a bump and Cruz (Joe Minoso) has a hard time expressing his true feelings for Brett. Meanwhile, Herrmann (David Eigenberg) and Connie (guest star DuShon Monique Brown) are forced to come up with an alternative solution when two birthday parties are booked on the same day at the firehouse.