Two new recruits join the emergency services and work with older, wiser partners. Davis becomes a policeman, like his father, and Carlos a paramedic. Two other Paramedics, Bobby and Kim, find themselves rushing from emergency to emergency. Bosco and Yokas, the other police officers, and Jimmy and his fellow Fireman have their own crisis' to deal with.

Bosco is caught on a security camera having sex in his squad car with the daughter of his Precinct Captain. Meanwhile Doc drags Carlos around the city on a personal mission to find the owner of a watch, found in the ambulance.

The two rookies, Carlos and Davis, experience disillusionment with their new jobs, and their training officers. Bosco struggles with Homophobia and gets himself involved in tit for tat games with Doherty.

Mercy's new E.R. attending gives the cops and paramedics a hard time while ignoring Carlos's attempts to hit on her; Doc is saddened to hear that Jerry has decided to take a disability retirement; Jimmy is upset when Joey goes to Bobby first after he becomes ill as a result of Jimmy's letting him overindulge in sweets; Jimmy and Bobby take out their conflict over Kim and Joey in a game of one-on-one; Sully and Ty arrest a purse snatcher who will do anything to stay in jail once he discovers that his victim's son is a mobster; Faith hands out street justice to a gangbanger responsible for the deaths of two little boys.

Ty is worried about Sully's dating Maggie; Faith and Bosco lose a witness who turns out to be the perp in a homicide; Bobby prepares for Matty's release from prison; while driving the bus, Carlos collides with a pregnant driver and later attempts to revive the baby she delivered prematurely after Sarah pronounces it dead, unaware of the consequences for the parents; Jimmy rescues a boy from a tree; Bosco and Ty take issue with Sully over his handling of a belligerent collar.

When he goes on his first raid, Davis inadvertently endangers a young boy he is trying to help; Doc begins to think that the overdose his father took may not have been accidental; to get a critically ill woman to the hospital, the firefighters knock down an apartment wall and lower her out a high story window.

Jimmy's failure to watch the firehouse door leads to tragedy; Morales, devastated by the loss of a young patient, reaches out to Doc for consolation; Sully's first partner commits suicide, prompting him to seek out Maggie and reflect on where his life has gone; Bosco tries to buy a '67 GTO from a homeless man; and Bobby continues to do whatever he can to get his mother to reconcile with his brother.

As he comes around a corner in pursuit of a gunman, Davis shoots a man who is pointing a gun at Sully, unaware that the man is innocently returning the service revolver which Sully dropped when he fell. Davis's guilt leads him to doubt whether he should remain on the force, until Sully straightens him out. The tension between Bosco and Faith continues to escalate. Both Bobby and Jimmy introduce their new girlfriends to Kim, who isn't thrilled with the potential competition.

Doherty shows his bravery trying to save the mother of two young children from a fire. Meanwhile Bosco and Faith are out looking for the man suspected of starting the fire in the first place. Davis tries to set Sully up on a blind date and after her pimp beats up Malcolm's sister they try to find him before he kills the man who did it. Carlos' girlfriend problems escalate and Doc's relationship looks like going to the next stage.

Yokas and Bosco chase a carjacker into a multi-level garage. When the thief drives off the edge of the top level and crashes to the ground, Bobby risks his own life to save the driver. Much to the surprise of everyone who knows him, Bosco goes to the opera with Nicole and her parents. Carlos gets into trouble with his boss and Vangie. Sully and Ty go to help Candyman on a job, and Ty tells Candyman exactly what he thinks of him. Jimmy has news for Kim which surprises her, and annoys Bobby everytime Kim tries to talk to him about it.

Sully lives his worst nightmare as the police search the city for a man who is buried alive and whose kidnappers are involved in a fatal car crash; Kim and Bobby find an abandoned 4 year old boy wandering the streets; Sully's mother wanders off from her nursing home; Carlos adopts a deceased patient's cockatoo.

On the hunt for a robbery homicide suspect, the police shake down all young black males they encounter, igniting racial tensions throughout the city. The suspect in question turns out to be Puppet, whose younger brother was killed as a result of Puppet's gang activity despite Doc's attempts to turn him away from the streets. After he's shot by the cops and goes into hiding, Puppet solicits Doc's help by proclaiming his innocence. The ensuing lengths to which Doc goes to get Puppet to the hospital and save his life while avoiding the cops wreak havoc with Doc's relationships with both civilians and the squads.

Doc and Carlos attend a stress debriefing; Carlos meets up with Bosco when he's ordered to attend sensitivity training.

Doc is thrilled when Sarah accepts his proposal, but is stunned when she informs him that she's accepting a job offer in Philadelphia and wants him to relocate.