When and Where to Watch

Release TueOctober 22, 2025
Network: NBC
T 9 p.m. ET (8 p.m.

For those outside the U.S. or streaming on demand, h

• Peaco AvaiOctober 23

• UK (BST): 2:

• India 6

• Australia (AEST): 11:00 a.m. on

If you prefer streaming, new episodes of Chicago Fire drop the nPeacock, NBC’s$10.99/mon (withad-free viewing and downloads for $16.99/month.

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What Happens in “Mercy”?

According to NBC’s official synopsis:

“Firehouse 51 must band together after a devastating fire catches them off guard; Vasquez continues his quest for answers; Violet and Novak face an unexpected roadblock in the new training protocol.”

This week’s episode will see Hermann’s family home engulfed in flames, forcing him into a desperate race to save his daughter Annabelle. The emotional fallout promises to test the veteran firefighter like never before. Fans are already dreading what’s to come, knowing Hermann’s history of near-losses and personal heartbreak.

Elsewhere, Vasquez pushes forward with his private investigation into his father’s imprisonment. As he digs deeper, the truth about his dad’s police career — and the corruption surrounding it — edges closer to the surface. Expect a major twist to start forming in this storyline.

Meanwhile, Violet and Novak struggle with a sudden shake-up in the paramedic training protocol, threatening to derail their progress and unity within the team.

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Previously on Chicago Fire

Episode 3 left viewers stunned as Firehouse 51 endured unjust layoffs and brutal budget cuts. When Mouch and his crew were pulled from duty without warning, Chief Pascal took the issue up the chain of command, only to learn City Hall was cutting six battalion chiefs to save money.

The fallout continued when a paramedic collapsed from exhaustion during a call — a stark reminder of how deep the cuts are hitting. With Violet and Field Chief Robinson pushing for firefighter redeployment to paramedic units, Episode 4 may show how those plans take shape amid chaos.

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Returning Cast

• Taylor Kinney as Kelly Severide

• David Eigenberg as Christopher Hermann

• Christian Stolte as Mouch

• Miranda Rae Mayo as Stella Kidd

• Hanako Greensmith as Violet Mikami

• Jocelyn Hudon as Lizzie Novak

• Dermot Mulroney as Chief Pascal

• Brandon Larracuente as Vasquez

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A Tragic Blaze and a Test of Brotherhood

With the fire at Hermann’s home threatening to shatter Firehouse 51’s morale, Chicago Fire Episode 4 promises a heart-wrenching blend of family, sacrifice, and courage. Viewers can expect fast-paced rescue sequences and deeply emotional moments as the crew rallies around one of their own.

Don’t miss “Mercy” — an episode that could redefine the bonds at the heart of Chicago Fire.