S10, EP12 "I Can Let You Go"
Sean O'Neal surprises Upton with a call from prison, revealing sensitive information; while Upton grapples with how to keep O'Neal at a distance, the team quickly mobilizes to stop a crime in progress before it's too late.
S10, EP11 "Long Lost"
A shocking ambush at a funeral leads the team into a heated investigation to find the shooters; much to Atwater's surprise, he must rely on someone from his past to help in the investigation, dredging up old memories and revealing new truths.
S10, EP10 "This Job"
A series of brutal home invasion robberies finds the team paired with Detective Borkowski, an old friend of Ruzek's, to work the case; things get complicated for Torres when it becomes clear Borkowski has a vastly different policing style.
S10, EP9 "Proof of Burden"
After a shocking discovery, the team begins closing in on Sean O'Neal with every shred of evidence they can find; determined to keep his son out of prison, Chief O'Neal hires a lawyer.
S10, EP8 "Under the Skin"
To distract Intelligence from the investigation into his son, Chief O'Neal forces the team to handle a "dead fish" case; when that dead fish turns into a complicated heater case, Burgess is thrown back into difficult memories from her past.
S10, EP7 "Into the Deep"
When actionable evidence finally surfaces against Sean O'Neal, Upton and the team work relentlessly to build a case in secret; they discover Sean is more elusive and dangerous than anticipated.
S10, EP6 "Sympathetic Reflex"
Atwater's reactions during a tense arrest are called into question; the team must dig in to uncover key evidence that could aid in the ongoing investigation and clear Atwater's name.
S10, EP5 "Pink Cloud"
Upton's dogged pursuit of a missing teenage girl leads the team into a dark web of human trafficking; chief O'Neal becomes involved with the unit's investigation when it becomes evident his son, Sean, has a connection to the missing girl.
S10, EP4 "Dónde Vives"
A shocking murder pulls rookie officer Dante Torres into his own neighborhood; as Voight and Atwater help him navigate the case and manage tricky personal dynamics with wary neighbors, Torres realizes his life may be forever changed.
S10, EP3 "A Good Man"
The team investigates a string of brutal pharmacy robberies, and Halstead connects with one of the victims about their Army careers; Upton suspects there is more to the story and confides in Voight.
S10, EP2 "The Real You"
When a convicted murderer hijacks a prison van, the team scrambles to find him and the abducted prison guard before it's too late; Burgess questions Ruzek's motives in a case, creating tension between the two.
S10, EP1 "Let It Bleed"
Still reeling from the death of informant Anna, Voight faces a new threat as he tries to keep the neighborhood clean; new wrinkles develop in the Upton, Halstead and Voight dynamic; the team gets a new chief.