Crews respond to a school shooting in which several teachers and students are killed.

Feeling neglected by her husband, Yokas dresses in leather and looks for a wild evening.

Doc proposes marriage to Dr. Morales, but her lucrative job offer in another city stymies Doc's joy.

A lethal batch of heroin circulates, killing addicts faster than paramedics can respond.

Firefighters from rival precincts must unite to conquer a warehouse inferno.

When a stress debriefing does not work, Carlos is ordered to attend a sensitivity seminar.

Bosco and Yokas search for a drug addict who shot a paramedic.

An old girlfriend asks Bobby to help a childhood friend, a former boxer who is now a drug addict.

Yokas, Bosco, Carlos and Doc get trapped in an abandoned basement.

Sully's career is on the line when he is accused of fabricating evidence.

Bosco risks his position when he goes after his mother's abusive boyfriend.

A sniper terrorizes the beat cops; Davis watches an officer die in his arms.

Doc wrestles with the memory of a life-changing deed he performed 20 years ago.

Taylor catches Doherty in a compromising position with another woman at his bachelor party.

Yokas confronts her alcoholic father and suffering mother.

Off-duty cops and paramedics try to relax after witnessing a fiery crash that killed teenagers.

Officer Davis rescues a traffic reporter from a sinking helicopter.

Kim hopes to reunite her broken family and must face painful truths about her mother and sister.

Recovering Doherty returns to firefighting but may be pushing himself too far.

The fallout of a violent fast-food robbery raises issues of racial prejudice.

Yokas discovers she is pregnant while on the trail of a rapist terrorizing the community.

The officers rush to find a kidnap victim who has been buried alive.