Magnum and TC put their lives on the line to protect an old Navy buddy who firmly believes the trio are marked for death from an enemy dating back to the Vietnam war.

As Magnum, T.C. and Nuzo plan to get to Ivan before he kills them, the Navy - in particular, Colonel Greene and Admiral Hawkes - have their own concerns and questions regarding Mac's death. But things are not as previously thought about Nuzo, and not only is T.C.'s life in great danger, but many other people's too, namely a Japanese prince.

A team of private investigators fly to Hawaii to recover a valuable and deadly native artifact, and find themselves in conflict with private investigator Thomas Magnum, Higgins, and a beautiful (but larcenous) socialite. The crossover continues on Simon & Simon S02E01 Emeralds Are Not a Girl's Best Friend (II).

The arrival by sea of a large crate destined for Robin Masters leads Magnum into a bizarre situation involving a wealthy Japanese businessman, his errant daughter and a fortune in pearls.

When TC's chopper, in which Higgins is a passenger, is hi-jacked for use in a spectacular prison break, it begins a dangerous chain of events for Magnum.

Higgins is on the hit list of African Mau-Mau warriors who are seeking bloody revenge on all ex-British soldiers in Higgins' old regiment.

A perplexed Magnum finds himself trapped in a time warp while attempting to clear a union leader accused of murdering a construction magnate.

An apparent freak fencing accident puts Higgins in jail for murder and Magnum on the trail of the real killer.

Earl Gianelli, an aged wrestler who hires Magnum to find his long lost son, puts the private investigator on a bloody trail of revenge.

Hired to protect a young tennis star, whose off-court behavior leaves much to be desired, Magnum finds his loyalties strained when a prime suspect turns out to be an old and dear friend.

Magnum is hired by a cocktail waitress who has been refused permission to scatter her dead father's ashes at Pearl Harbor, and wants Magnum to help her overcome Navy red tape.

Magnum offers to help a former Army nurse, now a doctor, who is accused of murdering three patients under her care.

A wealthy, much-hated practical joker caps his career by leaving Magnum over fifty million dollars in his will, much to the chagrin and potential enmity of his money-hungry relations.

When a valuable artifact entrusted to a modern day Samurai warrior is stolen, Magnum becomes involved in a culture and a way of life that hasn't altered in centuries.

A vicious macaw, trained to attack, is only one of the problems facing Magnum when an elderly woman claiming to be Robin Master's former high school English teacher arrives at the estate to write a book on ornithologists.

The president of a family owned business hires Magnum to ferret out the dishonest activities of his nephew, who is supposedly stealing from the company.

When Higgins is involved in a dangerous accident, Magnum's investigation leads to a murder that occurred forty years ago in a Japanese internment camp.

Magnum is pleased to see his friend, Marcus, driving a new expensive sports car but the pleasure turns to dismay when Marcus' battered body is discovered in the surf.

A customized plane, being piloted to Hawaii by Sam Houston Hunter, a Vietnam vet, crashes in the tidal pool at Robin's Nest and everyone assumes it was insufficient gas and pilot error that caused it.

Conned by an old friend, Magnum and TC agree to deliver a set of encyclopedias, not knowing that the knowledge contained within is a large marijuana drop.

It's an ill wind that proves prophetic when a tropical hurricane unleashes its fury on the evening of a very important social event.

Higgins' half brother, an Irish Catholic priest from Northern Ireland, arrives in Hawaii to confront a British officer who he claims stole an ancient artifact from his church.