Malone is sent to interview Professor Challenger, an explorer and researcher who believes he is on the trail of the "lost world," a mysterious place in Central Africa.

After receiving funding from the family of Jenny Nielson, a wildlife photographer and the daughter of a rich American contributor to the sciences, the "scientific community" agrees to organise an exploratory expedition under the leadership of the antagonistic Professor Summerlee.

Jim, Malone, and Malu narrowly avoid being eaten by a dinosaur (presumably a Herrerasaurus), only to find that their camp was attacked and the rest of the team is gone.

The three discover a gathering of native tribesmen (painted with symbolic skeletons) who regularly sacrifice humans off a cliff to the carnivorous dinosaurs.

The Royal Zoological Society in London rules that Challenger and Summerlee have insufficient evidence of their tale, until Jim reveals that he brought back a baby pterodactyl.

The team is celebrated for their achievements, but when Malone, Jenny, and Jim discover the pterodactyl (named Percival), is unhappy being kept in a zoo, they release him, allowing him to fly back to the "lost world".