That's My Partner - Chicago PD Season 5 Episode 18

Halstead stood behind Upton during the whole undercover sting because he knows what it's like to want revenge.
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Where's the Wire? - Chicago PD Season 5 Episode 18

Upton went undercover as her old identity "Kelly" to take down Booth, a man responsible for the death of her partner and love interest, Garrett.
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I'll Take the Blame - Chicago PD Season 5 Episode 18

There's chatter that Woods is gathering a grand jury to convict Olinsky. Voight assures him he will turn himself in if it comes to that, but will he keep his word?
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An Old Identity - Chicago PD

Upton brings back an old undercover identity to help take down a meth ring on Chicago PD. "Ghosts" is the 18th episode of the show's fifth season.
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Chicago PD Season 5 Episode 18 Quotes

Ruzek: Hey honey.
Antiono: Those were blanks, right?
Atwater: Hell yeah!

You guys are lucky I work here.

Antonio