Dr. Quest is missing while on an expedition to find the Yeti. Jonny and his friends head to the Himalayas to find him, but run into another scientist who's determined to bring back the Yeti.

A missing link is found in an alien spaceship that landed on Easter Island. But when Dr. Quest and Race enter Questworld to investigate what they've found, they run into Jeremiah Surd - who wants to experiment with human de-evolution.

En route to Nova Scotia in the newly christened Questor II, Jonny, Jessie and Hadji come upon a fog-enveloped island with a tragic history.

Ezekiel Rage plants a nuclear bomb in the bowels of Earth and Jonny and Jessie must revert back into time to stop his evil deed.

Holding an Anasazi beacon capable of calling the alien fathers of current technology, Alice Starseer is pursued by men in black and asks Dr. Quest for help, whose capture provokes a cross-country rescue by Jonny and Jessie.

Air Force One vanishes with the president within it, and all the evidence points to Benton Quest and Race Bannon. Jonny, Jessie and Hadji must elude government agents to prove their fathers' innocence by finding the real culprit.

Centuries ago, ruthless pirate Black Jack Lee rode The Ivory Web to the Bermuda sea floor. When oil explorers are assaulted by a ghost ship under his apparent captaincy, Dr. Quest prepares the Questor for an investigation.

Race is hired to contain a nerve gas leak in Chicago, the legacy of a botched raid on Dr. Jeremiah Surd years earlier. When he and Dr. Quest are trapped, it's up to Jonny, Jessie, and Hadji to find the renegade scientist.

In the Old West, the thief Belle Bonnet stole a wagonload of gold to help an Indian school stay open, but both thief and gold were lost in vast caverns under the American desert—until the Quests took the case.

Scientists are working on transdimensional technology that will help them open a portal to another dimension - and its denizens, who waste no time staking their claim on Earth.

Jonny and Benton venture into Jessie's mind to undo Surd's malicious attempt to strike at the Quest team from within - but it turns out that Jessie can take care of herself.

Dr. Quest travels to a Venetian mansion to authenticate the claims and machinery of paranormal scientists. The situation turns dire when the machine accidentally empowers a malevolent entity.

Surd lures Jonny into a labyrinth of horrors, after stealing the Apollo statue, which was reassembled by Dr. Quest.

During an expedition with Jessie's mother Estella, the Quest team discovers a plague that wiped out an ancient Inca-like tribe.

A memory of Pasha sends Hadji to Calcutta to search for his real father to figure out the truth of his past.

A seaquake releases a horde of murderous amphibians on a nearly-completed underwater research facility.

Dr. Zin launches the ultimate plan to defeat the Quests.

Dr. Quest is commissioned to find the Philosopher's Stone, which is reputed to turn dross to gold. When he succeeds in capturing the object, he donates it to the museum. It is stolen by Quest's partner, who wants to try it out for himself.

The insane Surd finds a way to switch bodies with Race and is ready to go on a rampage using his new identity. And now it is easier for him to kill Benton Quest (who can reverse the process).

With Benton Quest and Race Bannon attending a phenomenology conference in the Himalayas, Jonny and Jessie are forced to impersonate their fathers in Questworld when Jeremiah Surd launches a two-pronged attack on the Quest compound - and Hadji's mind.

A man named Ezekiel Rage seeks vengeance because of the tragic loss of his family in a covert operation when he was a government agent. And the Quest Team gets in his way...

Race has to cross an obstacle course where he set the record for Special Forces recruits -- but there've been some modifications since he was last there.

When Hadji rescues a beautiful girl in New Orleans, she exerts a strange influence over him.

When Jonny and Jessie challenge each other to a Virtual Reality game in Questworld, Surd intervenes with a challenge of his own.

General Vostok returns with the weapon that defeated Napoleon and he wants Benton to make it bigger and more powerful.