A vigilante is methodically and savagely wiping out criminals who have managed to slip through the fingers of the legal system.

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

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

A supposedly reformed sex offender believes he is going insane.

A flute-playing "Pied Piper" (played by Ricky Nelson) talks teenage girls into prostitution, then disposes of them when they are no longer convenient. Stone's daughter helps him break up this murderous prostitution ring.

Domestic terrorists take several people hostage, including Keller. Stone has to deal with not only the terrorists but a right-wing journalist and a vengeful father whose daughter was killed.

A skeleton discovered on Alcatraz is that of a convict who'd supposedly escaped in the 1950s.

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.

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.

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.

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

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

A prizefighter refuses to throw a fight, instead opting to throw the gangsters out the window of his hotel room. Injured, he hides in the hotel as both the police and mob close in.

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

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...

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.

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

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.

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

When a lady cop is killed in a drug sting gone wrong, her boyfriend cop decides to take matters into his own hands. Stone and Keller try to stop him.

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

Bill Bixby plays a former CIA hitman who is hired by some kooky generals to assassinate a Red Chinese envoy on a state visit to San Francisco.

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?...

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