After getting shot by Angela, Halstead is rushed to Med where he undergoes surgery as his team waits nearby with bated breath.

As Halstead is rushed to the hospital, his team sits on the sidelines and prays for him to pull through including his partner, Upton.

When Voight finds out that Angela plans on exposing what Halstead did, he doesn't take too kindly to the threat.

Ruzek offers support to Burgess for whatever she decides to do about their unborn child. Will she keep it?

Upton helps Intelligence out while Jay undergoes surgery in the hospital after being shot by Angela, a victim's wife that he was trying to help.

All of Intelligence bands together for their first case of 2020, which involves solving a murder and figuring out who is dealing illegal weapons on the streets.

Atwater is shocked to see his brother in Chicago and even more upset to learn that he's involved in something very dangerous.

Voight is determined to find the person responsible for selling military-grade weapons in Chicago and realizes it may involve Atwater's brother.

Burgess continues to work throughout her pregnancy as she hasn't informed her team yet. Will that change?

Intelligence is determined to get military-style guns off the streets in any way they possibly can on the Chicago PD midseason premiere "Mercy."

After getting shot by a victim he was helping out of guilt, Halstead's fate remains up in the air until the premiere on January 8, 2020.