Quincy investigates the death of a teenager who smoked marijuana treated with a chemical that stimulates plant growth.

Quincy and Danny go to the track and, while there, see a horse go wild in the stables. The horse kills one of the jockeys but, after completing his autopsy, Quincy thinks that it wasn't an accident.

A small turbulent South American island republic has babies dying.

The death of a teenage girl will draw Quincy into the world of teenage prostitution and child pornography.

Two customs officers want Quincy's help in catching arresting a diamond smuggling ring.

A policeman is killed while on a routine visit to a house. The killer turns out to be an old friend of Sam's, the gentlest man Sam has ever known. Arrested he admits that he killed the policeman and then, while in a cell, kills himself.

An evangelist whose church is being investigated by the government is found dead in a motel room., drugs and alcohol at his bedside table.

A girl falls off of a cliff while with her boyfriend. Quincy believes the boy's story that she committed suicide despite everyone else's belief that he killed her.

'R.W. Collins', a famous hijacker who escaped by parachuting out of a plane with his money five years ago is found dead, hanging from a tree in the National Park he bailed out over.

After two patients with low income die unnecessarily, Quincy is driven to change the policy of a private hospital that does not treat patients who cannot pay for the services provided.

On his way to a Forensic Pathologist convention in Sacramento, the Sheriff stops Quincy on the road. He was trying to stay awake by sticking his head out of the window. The Sheriff decides to put Quincy in jail for his own good.

When an old man commits suicide in a hospital, Quincy discovers the tragedy of parental abuse, and gets involved in a senior citizens center.

Quincy foils the plans of an assassin who is determined to kill an ill Latin American dictator visiting the United States for medical treatment.

Quincy and Sam are called to a prison to help investigate the murder of one of the inmates. Once there they soon find themselves held hostage by the prisoners when they begin a riot.

An autopsy leads Quincy to a stand-alone clinic where an under-qualified doctor, covering for another M.D., wound up inadvertently ending a life rather than saving one.

A teenager is killed during an auto accident.

Star gymnast Sally collapses during practice and dies. Quincy suspects that high school coach Virginia Hart is providing the team with performance-enhancing drugs to give them a competitive edge as they head into a national competition.

Quincy is upset when Asten makes him go on vacation and calls in a pretty young pathologist to perform the autopsy on a city councilman who was found dead at the base of a stairwell.

An incompetent surgeon performing operations in his ill-equipped office causes the deaths of a boxer and a chef.

An old friend of Quincy's is dead following a plane crash.

Three deaths due to food poisoning are linked to a football stadium where a big championship game is due to take place. Quincy has three days to find the source before 90,000 spectators come to watch and are put in jeopardy.

A gunshot victim's death may have been caused by a doctor's incompetence... or it may have been the work of a professional killer.