Count Saknussemm lures Lindenbrook's party into a trap. Luckily the a man-beast inside the trap turns out to be friendly. While traveling a volcanic region, the entire party is captured by a giant who pits them against prehistoric beasts in his personal arena.
Alec is captured by Wolf men who have aligned themselves with Count Saknussemm. While Lindenbrook attempts a rescue, Lars and Cindy team up with the Wolf men's enemies, descendants of the ancient druids.
The professor builds a swamp buggy for Lars to drive. The moss creatures kidnap Lars and thanks to Saknussemm;s interference, he and Alec are grabbed as well. Luckily the professor and Cindy get help from the swamp people.
When Arne Saknussemm first passed through the underground frozen wasteland of the Living Totems, their precious Aurora Borealis diamond was taken by the snow people. Now Livingstone and friends have to get it back.
Near volcanic Destruction Canyon, the Lindenbrook expedition finds a map by Arne Saknussemm. Alec and Cindy are hit by a strange petrifying gas and Count Saknussemm takes them hostage to trade for the map.