Season 4 - Episode Guide

A citywide blackout fuels a rioting mob that traps Davis and Sullivan.

Bosco chafes under a female unit leader's authority while investigating a weapons ring.

The parents of a missing boy seek vengeance on a known child molester.

Doherty struggles to extricate trapped motorists in a multivehicle collision.

Russian gangster Chevchenko shatters Sully's world.

Russian gangster Chevchenko shatters Sully's world.

Bosco burns to catch an arsonist after failing to rescue a woman from store fire.

Yokas and her daughter are taken hostage during a bank heist.

A suspect will get away with murder unless a boy steps forward to testify.

A shooter ambushes Bosco, Doc and Carlos as they transport an injured witness.

Doc breaks in a rookie paramedic; the Sex Crimes Unit approaches Carlos.

A patient claims Carlos groped her; Yokas breaks up a domestic dispute.

Yokas' daughter gets trapped in a snowdrift after using a drug.

Yokas keeps vigil as Emily fights for her life; Sgt. Cruz is on a mission.

Bosco and Cruz are trapped in a meth-lab inferno.

Phony distress calls keep the police on edge and prevent responses to real crimes.

Firefighters struggle to free an impaled driver; Sully puts Davis at risk.

Ty, Bosco and friends help Sully to dry out.

Kim falls for a famous journalist in the aftermath of an armored car crash.

Noble is arrested and agrees to use his contacts to set up a drug deal with a notorious dealer.

Bosco must choose between truth and his partner's desire to find her sister's killer.

Cruz and Bosco are on a collision course with their informant.