|Season 5, Episode 18|
|Airdate||March 21, 2018|
|Written by||Gavin Harris|
|Directed by||Nick Gomez|
Upton brings back an old undercover identity to help take down a meth ring spearheaded by a former criminal contact. And with pressure from Woods mounting, Voight calls in a favor for Olinksy.
- Jason Beghe as Sergeant Hank Voight
- Jon Seda as Detective Antonio Dawson
- Jesse Lee Soffer as Detective Jay Halstead
- Tracy Spiridakos as Detective Hailey Upton
- Patrick John Flueger as Officer Adam Ruzek
- Marina Squerciati as Officer Kim Burgess
- LaRoyce Hawkins as Officer Kevin Atwater
- Elias Koteas as Detective Alvin Olinsky
- Amy Morton as Desk Sergeant Trudy Platt
- Ian Casselberry as Carlos Perez
- Sam Straley as Tyler Whitlock
- Francis Guinan as Jeff Rafferty
- Titus Welliver as Ronald Booth
- Christian Forrest as Scott Jansen
- Christoph Ptack as Priest
Halstead: Well, Platt offered to buy shots which is a once-in-a-decade thing so you might want to reconsider.
Halstead: He wins if you do it, this is not how you beat this.
Upton: I can handle this, Jay.
Halstead: That's exactly what I sad to you. You remember that? You called me out and told me I was full of crap.
Halstead: She's my partner, so if you know something that's putting her in danger, I need to know, now.
Upton: One minute he's talking ring sizes and the next, he's gone. So, screw him.
Ronald: So why keep the picture?
Upton: To remind me to never make the same mistake again.
Ruzek: Hey honey.
Dawson: Those were blanks, right?
Atwater: Hell yeah!
Dawson: You guys are lucky I work here.