En gruppe, ledet af professor George Challenger, samles for at tage på en ekspedition, der vil finde flere bevis på, at forhistoriske skabninger stadig lever. De aner ikke hvem og hvad der venter dem dybt inde i Amazonas-junglen.

Desperate to escape and more than a little greedy, Marguerite offers Veronica to a tribal chief in return for jewels and safe passage off the plateau for her group.

When Roxton is running from a tyrannosaur, the earth suddenly swallows him up; the party follows a river to an underground ocean.

Stung by a giant bee, Summerlee lies near death; Challenger seeks a way to repel an attack by the ape-men.

In order to free Challenger from her tribe, the team must retrieve the bones of a warrior queen's husband.

Christecs brand Summerlee (Michael Sinelnikoff) a devil after he revives a drowning child. With Peter McCauley, David Orth, Rachel Blakely, William Snow and Jennifer O'Dell.