Mike's former partner returns to San Francisco, but not because of any longing for the good old days. He's back in town to kill the hired gunman who murdered his son years before.

After spending a "lousy" 12 years in prison for a brutal sexual assault and murder, a young punk returns to San Francisco to seek revenge against Mike Stone (who was the arresting officer). And he's not picky about how he'll take that revenge -- or on who.

A father finds out that the man who murdered his deaf son is released on a technicality.

A teacher is murdered at an exclusive all-boys prep school.

A single .25 caliber pistol affects many lives in a single weekend.

Stone and Keller work to crack a kidnap case where the mother is friends with an alleged psychic.

Stone goes undercover as a bum to investigate the beating death of three homeless men.

While investigating a lead, Steve is run over by a car and rendered a vegetable. Mike insists on taking revenge, and is demoted to walking a beat.

Stone must protect a former book keeper's wife, in order to have her testify against several high profile mobsters who want her dead because of the evidence she has against them.

A cowboy was trampled to death by a bull; his mates suspected it to be murder.

Arnold Schwarzenegger plays a bodybuilder with a strong body but a fragile ego, who causes trouble wherever he goes.

Inpector Stone and Robbins go after a gang of thieves who use motor cycles to make their get away.

Stone and Keller search for the only eyewitness to a shooting -- a self-proclaimed doctor who gave them a false name.

A man seduces the widow of a bank robber. The money he stole was never found. When she tells him where it is, he kills her and sets out to take the money from her children out in the country.

When a boy disappears after school, suspicion falls on the neighborhood recluse, who is popularly known as a pedophile, although never convicted.

A retired hit man returns to San Francisco, not knowing that he will be the target of a hit.

Mike thinks he's a murder target when a kidnapper specifies that he deliver the ransom money.

A bum blackmails a black guy. The bum's friends roll him for the money and attempt to pin his death on the black guy, who is the lovable and successful nanny to a young kid. What's the black guy hiding?...

Internal affairs suspects that something is amiss when a witness under police protection is killed. Someone in the Department is a Syndicate informer--and everyone is under suspicion, even Stone and Keller.

Mike Stone has reason to believe that the death of a politician is no accident.

A policewoman's son has an unusual hobby -- he holds up taxicabs. Eventually this results in the murder of an undercover cop.

San Francisco's social elite are suspects when a publisher who blackmailed them is found murdered.

Stone clashes with an abrasive NYC cop who is on the trail of his partner's killer.

A troubled teen from a broken home is suspected of shooting a friend's stepfather.

A sleazy radio host is accused of murder when a former girlfriend, who was pregnant, is shot.

When a gang of smuggling sailors kills a jeweler, they realize they have to eliminate his girlfriend for being a witness, and Keller, who is transporting the girlfriend to jail.

One witness in a racketeering trial is killed with a booby-trapped car, and Stone worries that the remaining witness, Roy Chaffee, will be picked off by a hit man if he surfaces.

An abused wife vanishes after a vicious attack by her drunken husband and all clues point to murder with the husband as the prime suspect, but he can't remember if he did it or not.

A retired cobbler takes the rap for a shooting to protect the real killer, the grandson of his best friend.

Women keep turning up in hotel rooms strangled; the only lead is a witness who thinks he saw an air force Colonel's uniform. Keller goes undercover as an air force officer to infiltrate the base.

After a female detective is killed by the rapist she had been bait for, her roommate (played by Brenda Vaccaro) goes on the warpath to catch him. After Mike Stone kicks her off the case, she continues on her own, hurtling headlong into peril.

While a psychopathic killer uses San Francisco hi-rises as target practice, Stone and Keller have to contend with a new Captain who immediately countermands everything they do.

Keller goes undercover at a mental hospital to uncover the truth about a string of mysterious deaths.

A high-ranking hoodlum hires the androgynously-named "Sidney"--a hitwoman who's assigned to murder the three thugs responsible for the death of his son. She decides to let the police do her digging for her and moves in next door to Keller...

A woman who has dedicated her life to a prominent family fails to see her neglected son has fallen in with a psycho—and may have helped him kill a woman.

An undercover cop is murdered with Stone's gun, and a hotshot young inspector seems determined to pin the rap on Stone.

A cop seeks to catch his brother's murderer by going undercover in an illegal gambling operation.

Mike and Dan pursue a smuggler who will stop at nothing to locate a dog collar containing stolen diamonds.

Stone searches for a fugitive, and is dogged by the fugitive's innocent and naive daughter.

Crooks heist a truck filled with gold, not knowing that the gold is the irradiated byproduct of a power plant experiment and extremely toxic.

A narcotics cop who has only four months to go 'til retirement roughs up a drug pusher and plants a knife on him. Meanwhile, an operation begins to uncover the "Tucson connection," a major drug ring operating in San Francisco.

A nice, normal 16-year-old hooker keeps having her johns turn up dead; Dan is particularly horrified by the case.

One of the girlfriends of a young charmer recognizes her boyfriend as the man who stuck up her bank.

Stone and Keller face off against Gilliam, a wealthy executive who transforms women into his own special image of perfection, then kills them when they inevitably fail to live up to every demented standard of his.

Mike pushes to get teen gang members, who have made a mockery of the juvenile court, tried as adults.

An episode where there are two parallel stories: A small business owner is going through divorce proceedings while his business is in financial straits. His wife's lawyer just happens to also be hunted by a revenge-seeking ex-con.

Stone and Keller finally get a lead on a serial killer who has been knifing prostitutes when one of the victims survives the attack.

A retired history teacher goes off the deep end and takes it upon himself to take a group of his former students hostage in an empty, condemned school. There, at gunpoint, he proceeds to teach them the finer points of history.

A mobster's son steals loot from his father and seeks protection from federal authorities in exchange for being a material witness against his father.

Refusing to believe he murdered his wife, a man escapes from an institution for the criminally insane to find her.

A black police informant is murdered, but the police seem more concerned with the death of a white business man. His flinty daughter forces the police to go after his killers.

Keller, temporarily partnered with a hotshot detective, sets out to discover why his new partner seems to be absolutely convinced of a murder suspect's guilt for no apparent reason.

A bishop (Mike's friend) tries to protect the person who shot him, but revelations in the course of the investigation start to shed suspicion on the bishop's accounting of events entirely.

When an Immigration raid goes wrong and a security guard is killed, the prime suspect becomes one of the illegal immigrants.

A youth-center worker is caught in a war between two teenaged street gangs, a war that really has the heat turned up when one of the gangs obtains automatic rifles.

A Vietnam veteran goes AWOL from the army in order to kidnap the son he has never seen.

A philandering professor is killed and his mistress shot by a sniper who has been terrorizing a college campus.

A man offers a $1,000,000 reward for the capture -- dead or alive -- of the man who raped and murdered his daughter, throwing the city into greed-fueled chaos.

A rapist targets Stone's daughter and her friend; a radical feminist organization encourages them to take matters into their own hands.

Lieutenant Stone is placed in the awkward position of investigating a burglary with Irene Martin, a lady cop -- who is also his girlfriend who he's just proposed to. She resents his intrusion into 'her' case and their relationship unravels.

When a police officer is fatally shot 3 days before he is due to retire, Stone undertakes a relentless search for the killer.

Keller returns fire during a chase in a dark shopping center, killing a kid, but the body comes up unarmed. The boy's father insists Keller is a murderer.

A salesman attending a convention wrongly believes that he is responsible for the death of an attractive female hitchhiker who had lured him to her houseboat.

A supposedly reformed sex offender believes he is going insane.

A small-time crook accidentally heists a fantastic sum from a small store that is actually a Syndicate front.

A music producer turns up dead; a popular singer he was producing an album for is convinced that he is going insane and killed the producer, but the truth is stranger.

Property owners who refuse to sell their parcels find themselves murder victims at the hands of a developer.

In order to stop a psychotic priest-killer, Stone goes undercover as a Roman Catholic priest. The victims were all clergymen who studied at the same seminary.

A man who served 12 years in prison to protect his brother gets out only to find that the brother never told their father, a Greek restaurant owner, the truth about who should have gone to jail.

A cop (Nielsen) who finds out that he has a terminal illness, sets out to kill a racketeer (Danton) who had been his quarry for the last year and a half.

Lieutenant Stone and Inspector Keller go after two insurance agents involved in the counterfeiting of an 1850 2-cent purple Guyana stamp which had a value of $250,000.

When a female college student is killed on campus, suspicion falls on a prison inmate allowed temporary release to work in the college's print-shop.