S4 E1 • Lamb to the Slaughter

When burglar Brad Gifford is arrested, his cop-hating, now orphaned son, Jody, is taken to Lambert Hall where he is befriended by Ryker, a former orphan himself. Jody is just beginning to trust and like Ryker when his father, aided by Augie Baker and P.G. Larkan, escapes custody and comes for him. Ryker is taken hostage. The group is traced down by Mike and Terry. In the resulting shootout, Augie is killed, P.G. arrested, and Brad Gifford is mortally wounded. Jody is taken back to the home where he is given foster parents, and a new life.

Première diffusion : 9 septembre 1975

S4 E2 • Reading Writing and Angel Dust

After the tragic death of a bright high school student, the rookies put in a team effort to get the pushers off the school campus. They get some help from a pusher who is pretending to scorch for the source.

Première diffusion : 16 septembre 1975

S4 E3 • One-Way Street to Nowhere

Mike is critically injured when he tries to capture the leader of a militant group and Terry is taken hostage.

Première diffusion : 23 septembre 1975

S4 E4 • Someone Who Cares

An unidentified nine-year-old girl is accidentally hit by a car after two hedonistic ""swinging single"" men spike her lunch with narcotics. Before she dies, she begs Terry for help. Terry, reluctant to let her die a Jane Doe, investigates.

Première diffusion : 30 septembre 1975

S4 E5 • Ladies Day (a.k.a. Ladies Kill, Too)

Jill is working in a womens prison, fighting an outbreak of diphtheria. In order to protest for better food and working conditions, inmates take Jill Danko and Dr. Malcolm hostage.

Première diffusion : 7 octobre 1975

S4 E6 • Reign of Terror

Young crooks Pat Stevens and Glen Barton rob ticket agent Brewster and shoot rookie Chris. The scene is witnessed by mailman Charlie Brooks, who is adamant about not getting involved. Eventually his wife, Nadine, and daughter, Stacy, encourage him to cooperate with the rookies, and finally, the criminals are apprehended.

Première diffusion : 14 octobre 1975

S4 E7 • Death Lady

Première diffusion : 21 octobre 1975

S4 E8 • Measure of Mercy

The rookies must investigate a robbery at Memorial Hospital. The blood bank was robbed and its contents sold to the black market, leaving an infant at the hospital on the critical list.

Première diffusion : 28 octobre 1975

S4 E9 • A Time to Mourn

Chris' sister makes a surprise visit on her brother. He is suspended after conducting an unauthorized bust of the man who molested her.

Première diffusion : 4 novembre 1975

S4 E10 • The Torch Man

Première diffusion : 11 novembre 1975

S4 E11 • Invitation to a Rumble

Première diffusion : 18 novembre 1975

S4 E12 • Reluctant Hero

A rookie accidentally overpowers a professional assassin and is named ""hero"". The assassin vows to kill the rookie and escapes with Jill as a hostage, offering to exchange her for the rookie.

Première diffusion : 25 novembre 1975

S4 E13 • Dead Heat

Chris and Terry have their patrol car stolen by teenage vandals while investigating a major robbery in a department store and three heavily armed killers trap them there.

Première diffusion : 2 décembre 1975

S4 E14 • The Voice of Thunder

After a series of Sunday bombings of porno bookshops and massage parlors sweep the city, Chris and Terry recognize the same girl, at the scene of each incident. The dangerously schizophrenic top fashion model believes she is being instructed by a supreme being.

Première diffusion : 9 décembre 1975

S4 E15 • The Code Five Affair

The rookies stake out an abandoned factory where a heroin deal is about to take place, and are able to seize the drugs and arrest all but one man. This man must get the heroin back from the police.

Première diffusion : 16 décembre 1975

S4 E16 • Shadow of a Man

Forest, a tough career cop, takes $10,000 from the scene of a robbery after his partner is killed by the robbers. Lt. Ryker puts an undercover investigator on the case to retrieve the money.

Première diffusion : 23 décembre 1975

S4 E17 • Eye for an Eye

Première diffusion : 30 décembre 1975

S4 E18 • Sudden Death (a.k.a. Return from the Past)

Première diffusion : 6 janvier 1976

S4 E19 • From Out of the Darkness

Terry vows to find the murderer of Dan Kennedy, a retired cop turned security guard. Dan was the father of a blind girl, Terry's former girlfriend.

Première diffusion : 20 janvier 1976

S4 E20 • The Mugging

After a woman is fatally assaulted by three junkies, her son, a doctor in the same hospital where Jill works, announces his intention to get revenge against the three, who were released from jail on a technicality.

Première diffusion : 27 janvier 1976

S4 E21 • Blue Movie, Blue Death

The rookies are given undercover assignments in order to smash a syndicate-owned porno film company responsible for the deaths of some of its actors.

Première diffusion : 24 février 1976

S4 E22 • Deliver Me From Innocence

A frightened sixteen-year-old boy is forced to take the blame for the crimes of a junkie he has become mixed up with. The two had committed a burglary and escaped after killing a cop. The boy is Terry's current girlfriend's brother.

Première diffusion : 2 mars 1976

S4 E23 • Journey to Oblivion

A gambler kills his creditor and is witnessed by Jill Danko whom he and his accomplice must now do away with. Another episode dedicated to nurse Jill Danko. In this episode Jill bears a big resemblance to her later character Sabrina Duncan.

Première diffusion : 30 mars 1976