A writer of adventure stories indulges in a sudden urge to travel to the islands of the Pacific, and soon finds himself shipwrecked on a remote South Sea island.
Prompted by a mysterious Icelandic manuscript, a professor and his nephew, with the aid of a local guide, adventure to the center of the earth through the crater of a dormant volcano.
Two scientists discover a substance which promotes rapid and extreme growth in plants, animals, and humans, leading to unexpected and alarming consequences.