An unexpected visit throws Casey for a loop. Severide sets out to exonerate a wrongly convicted arsonist. Kidd pays the price for burning the candle at both ends. Cruz goes on a mission to fix one of Otis’s old toys.

Trapped inside Paddy's with a suicide jumper on the roof, the Gang wonders if they should bother intervening with an algorithm of their own - Could he, would he, should we?

Dennis and Charlie stand guard at the entrance to their laser tag base waiting to ambush the legendary "Big Mo," but Dennis begins to ponder the reasons they play laser tag and if their pursuit of a victory is worth their effort.

Cam and Mitchell’s friends mistakenly assume they have split up and have definitely chosen a side. Haley attempts to cook Thanksgiving dinner as a thank you for Claire and Phil’s support with the twins. Jay invites Phil and Dylan out to fly his model plane. Phil thinks this is his chance to reclaim his dignity after their first outing 10 years ago went so wrong.

Jimmy welcomes singer Dolly Parton plus an interview with and musical performance by Kacey Musgraves.