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.
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.
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.
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.
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.
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.
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.