Lars injures his arm fighting a pterodactyl. He and Cindy are separated from the Professor and Alec who are captured by a tribe of prehistoric cavemen.

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.

The travelers arrive on an island that is so close to the Earth's magnetic axis, it has become magnetic itself. The magnet people want Lindenbrook to build them a boat to escape their doomed island.

Chief Hok of the Frozen Furies is chipping ice from the underground glaciers of Norway. Lindenbrook intends to stop the Furies drilling sound devices to save the surface world.

Captured by bee people who live in an underground hive, Lindenbrook and friends must team up with Saknussemm and Torg to escape.

The Lindenbrook party travels an underground river to the land of the dead, very similar to the one described in Greek myths. An ancient Latin civilization captures Saknussemm, Torg and Alec.

Crossing an underground desert in a makeshift sand boat, the travelers come upon a deserted city where some controlling presence pits all the insects, statues and even a group of mummies against them.

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.

Crossing a dry ocean bed, Lindenbrook and co find various lost ships including The Flying Dutchman manned by frog people who dress and act like pirates.

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.

The Land of the Giants is the setting of a war between the giants and the Lilliputian people from across the river.

Lindenbrook inadvertently brings the fossils of the Earth's first civilization back to live with fire. Saknussemm attempts to enslave the fossil beings, but they intend to rule the world themselves.

Captured by the soldiers of Zeerah, the Lindenbrook party is taken before the sorceress Queen Mortia. Lindenbrook tries to convince her he has magic powers of his own.

Professor Lindenbrook and his friend have finally found the golden city of Atlantis and their way back to the surface world - or so it seems.