The Quest family and their bodyguard investigate strange phenomena and battle villains around the world.
Cast: Mike Road, Tim Matheson, Don Messick, Danny Bravo, Henry Corden, Jayne Bentzen, Denny Albee, Forrest Compton, Joe Lambie, Joel Crothers, Sharon Gabet, Ann Flood, Lois Kibbee, Lee Godart, Ann Williams, Wade Nichols, Lew Resseguie, Robbie Richardson, Nigel Lindsay, Menna Trussler
The Quests land themselves smack dab in the heart of a seafarer's fantastic and nightmarish yarn, complete with a ghost ship, a prowling sea monster, a hold full of coffins, and hidden treasure.
Dr. Quest's surprise visit to his friend Raj Guru in the high Himalayas of Nepal coincides with a storm having driven the yeti from the mountain into the old palace nearby, or so it would seem.
A mad scientist's sloppy handling of growth bacteria results in giant animals running amok. He abducts Dr. Quest to ensure his help, forcing Race to turn to an old friend to find him.
En route to a Norwegian castle, Jonny can't get the others to believe he saw a periscope following their boat through the fjord, then later seeing a stone gargoyle move.
Someone goes to great lengths to keep activities in the Quetong swamp lake area private. Dr. Quest gets involved when asked to determine why local fish are suddenly starting to make area fishermen sick.
In Africa, the Quest party is threatened by a psychopathic German war criminal and his obedient troop of all-male Neanderthals.
A fellow scientist accidentally creates living energy that only lives to feed on more energy, including that from living organisms. The Quest party answers his plea for help.
Marooned after a boat fire, Jonny, Hadji and Bandit are taken in by friendly island apes. Two poachers, hearing of a reward for their return, seek to profit by turning the Quests' misfortune into a ransom demand.
Foreign agents hijack Dr. Quest's new Underwater Prober, taking Race, Jonny and Bandit prisoner.
In the Canadian woodlands, the Quest team encounters French-Canadian smugglers as well as a Native American guardian and his canid companion.
The atypical behavior of a volcano catches Dr. Quest's interest, initially unaware that it's the latest weapon project of Dr. Zin, protected by sharpshooters on hovercrafts.
Dr. Quest heads up the Amazon to the Land of the Turu in pursuit of high grade trinoxite, a new metal essential to the space program, unaware that "Turu" is a live pteranodon guarding the deposit.
The Quests visit an old colleague, an esteemed biologist who now turns out to be an insane breeder of vicious monster lizards.
In the jungles of Brazil, Hadji, Jonny, Race and Bandit get on the bad side of a tribe of angry and relentless pygmies after saving their human sacrifice from death.
Voodooism is held responsible for all but one last owner deserting plantations on Tanaiga Island, but Dr. Quest believes drugs are more responsible than mysticism.
When the Quests discover sunken treasure, they're taken prisoner by local pirates.
The Quests make an emergency landing in the Andeas where a German World War I ex-fighter pilot wants to take on and kill Race in an aerial dogfight.
While Dr. Quest scouts Thailand for hallucinogenic plants, Race is secretly replaced by a lookalike enemy agent seeking Benton's formula.
As Dr. Quest works on an revolutionary new weapon, Dr. Zin sends an advanced and unstoppable spider-like robot to examine it.
Home movies from India reminds the Quests how Hadji came to join their group back when Dr. Quest had dealings with a secret nerve gas factory in the snowy Himalayan mountains.
Tomb raiders give Quest's party a hard time on a South American government-sponsored expedition to assess a remote lost city.
The Quest family goes to India to investigate the source of fake gold, but Dr. Zin is determined to stop them.
To save Dr. Quest and his friend from a ritualistic sacrifice to a native fire god, Race must convince savage tribesmen that he's their water god, that he's powerful, and that he's angry.
A plot to frame Dr. Quest for the theft of a national Egyptian treasure awakens an ancient mummy to dog the steps of the true culprits.
A rocket malfunctions and crashes in the Arctic. Dr. Benton Quest is dispatched to find the rocket but must contend with operatives of a hostile foreign power whom are seeking the same thing he is.
A foreign power uses the Sargasso Sea to conduct laser experiments and employs "lizard men" to scare away potential interlopers.