Jennifer is stalked by a psychotic stage manager who lurks in the wings as the Harts don top hats and tails to perform in a charity benefit in the Big Apple.

The Harts become involved in international intrigue when they infiltrate a ballet company to clear a world-renown Soviet danseur of murder charges.

A hitwoman is sent to kill a commissioner and ends up taking Jonathan, Jennifer and Max hostage.

Jennifer's cousin slips into a coma after being continually drugged by the owners of a health club.

A dying man gives Jonathan and Jennifer an ancient Buddha statue. The Harts are then thrown into intrigue and danger when they are pursued by Chinese henchmen and a diabolic giant.

The Harts are asked to ransom two scientist employed by Hart Industries when they are kidnapped in South America. When Jonathan, Jennifer, and Max, they wind up mounting a mid-night raid against the wealthy and powerful kidnapper.

The Harts new musical investment (singer Lorene)is beginning an International tour. The singer's husband Jesse, a jewel thief, has a costume made for her that sparkles with diamonds. The outfit is loaned to Jennifer and Lorene's husband is desperate to retrieve it.

Jonathan thunders into the glamour and excitement of polo, unaware that he and Jennifer have become targets for murder in a smuggling scheme using a prized polo mallet to transport a $1-million gem.

While in Greece, Jonathan and Jennifer race to save their lives and the future of Hart Industries when a European business magnate seeks to destroy them during a cross-country car rally.

Vince, a friend of Max's, arrives in USA to open a chain of health clubs. International criminals smuggle a solid gold barbell into the country with Vince's entourage.

Jonathan purchases their Honeymoom bed, but the wrong bed is delivered. In their search for the ""real"" bed, the Harts become entangled in an international art smuggling scheme through San Francisco and the Napa Valley.

Jennifer takes on a glamorous modeling assignment, not knowing that the camera is rigged with an explosive device, as Jonathan races to stop the deadly scheme concocted by a vengeful man from her past.

The menu features murder when the Harts take a gourmet cooking class. The Harts vie with an unscrupulous financier for a recipe which might benefit the world.

Industrial espionage is a problem at Hartoy company. When the investigator Jonathan has hired is murdered, the Harts go undercover in an attempt to foil the crooks and save the company from financial destruction.

Max creates a rose hybrid he calls the Jennifer Hart Rose and enters it in a prestigious rose contest under Jennifer name. She becomes the target for murder when she is stalked by a psychotic leading judge.

The Harts witness a murder when the spiritual mentor and bridegroom of Jennifer's aunt meets an untimely death.

While vacationing on the exotic island of Rhodes, Jennifer and Jonathan become ensnared in a scheme for the smuggling of ancient Greek artifacts and are nearly entombed in the process.

Jonathan and Jennifer pose as a professor and a student in a dangerous scheme to expose the person responsible for the drug framing of Max's nephew, a college basketball star.

The Harts south-of-the-border boating holiday turns Jonathan and Jennifer into desperate fugitives, on the run from Mexican police and a gang of drug dealers.

A young boy shows up at the Harts gate in the middle of the night claiming to be Jonathan Hart, Jr. The child proves to be the unwitting pawn in his biological father's criminal plot.

The Harts have a deadly encounter when they enter the mysterious world of psychic phenomena. A Hart Industies employee with amazing powers of ESP, a twin sister, and a wealthy grandfather, becomes the target of a deranged killer.

The Harts take a luxurious cruise on a Hart Industries liner to investigate a series of jewel thefts. They find themselves at the mercy of the jewel thieves' rival burglars.

Normally finicky, Freeway is quite fond of a new dog food and ends up in a dog food commercial. When the Harts have a party, some of Freeway's new food is mistakenly ingested by some guests who then behave as if drugged. Jennifer and Jonathan are in danger when they attempt to find out its secret formula.

During an Opening Night party for a new Egytian exhibit at the museum, the man who discovered the tomb is murdered. The Harts become involved in the investigation when Jennifer sees a mummy at their home

Max's ex-wife, presumed dead for over 10 years, arrives in Los Angeles. Her friend is murdered, so she calls Max for help. When two thugs try to grab her at the park, she is injured and Max is kidnapped. Demands are made for a necklace about which the Harts know nothing.