At The Earth's Core And Out Of Time's Abyss

Imagine digging a super tunnel right through the Earth with a giant machine called the Iron Mole, and popping out into a sunny world inside with dinosaurs, cavemen, and mean lizard people who control everyone's minds! Heroes David and Perry fight back, make friends with a pretty cave girl, and start a big rebellion to be free. Then, on a weird island called Caspak, brave soldiers crash and discover animals that grow up super fast from goo to people, battling bird monsters and helping everyone escape the crazy place where evolution happens in days, not millions of years!

In 'At the Earth's Core,' inventor Abner Perry and his young associate David Innes construct the Iron Mole, a mechanical digger, and burrow through the Earth's crust into Pellucidar, a vast hollow inner world illuminated by a miniature sun, populated by prehistoric creatures, stone-age humans, gorilla-like Sagoths, and tyrannical telepathic reptiles called Mahars. Captured by the Mahars, David escapes, falls in love with cavewoman Dian the Beautiful, masters the language and customs, and ignites a slave rebellion to overthrow the reptilian overlords, blending high adventure with themes of human ingenuity against ancient evil. 'Out of Time's Abyss,' the final tale in Burroughs' Caspak trilogy, follows WWI aviator Bradley, stranded on the mysterious island of Caprona where life evolves rapidly from primitive amphibians to intelligent humans in a single lifetime due to unique biochemical forces. Facing carnivorous monsters, flying Weiroos who capture women for breeding, and warring tribes at different evolutionary stages, Bradley allies with the red martian-like Galus, rescues captives, and unravels the island's evolutionary secrets, culminating in a daring escape that pits human courage against nature's savage continuum.