Med bevis för att förhistoriska varelser fortfarande lever, samlas en grupp under ledning av professor George Challenger för att ge sig ut på en expedition för att upptäcka mer. De anar inte vem, och vad, de kommer att stöta på djupt inne i Amazonas djungel.

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.