Edward Malone, Eric McCormack, a curious junior reporter craving a bold story, is sent to interview Professor Challenger, John Rhys-Davies, an intrepid explorer who insists he is on the trail of the legendary lost world hidden somewhere in Central Africa. Challenger’s bold claim is met with sarcasm by the British scientific community, yet funding arrives from the family of Jenny Nilson, Tamara Gorski, a wildlife photographer whose connections heighten the intrigue surrounding the expedition. The mission is officially led by the stern and often quarrelsome Professor Summerlee, David Warner, who agrees to bring Malone and Nilson along but resists inviting Challenger. Reluctantly, Challenger hands Summerlee a mysterious map to be opened only at a road-end village on a precise date, a directive that promises both danger and discovery. As the party prepares to depart, Malone’s newsboy friend Jim, Darren Peter Mercer, secretly stows away, setting the stage for an unpredictable journey.
In Africa, the group is joined by a capable local guide named Malu, Nathania Stanford, and a Portuguese scout named Gomez, whose motives and loyalties become murky as the trek unfolds. When Summerlee finally examines Challenger’s map, it appears blank, and Challenger suddenly materializes, compelling Summerlee to accept his guidance after all. Together they locate the cliff that matches the illustration and ascend to the surprising world above, only to find themselves temporarily stranded when Gomez reveals a hidden past connection to Challenger’s earlier expedition. The ascent leads them into a landscape populated by towering ferns, strange flora, and, most strikingly, dinosaurs—ranging from a pair of Anatotitan to a thriving pterodactyl rookery perched overhead.
The group faces immediate peril: Jim, Malone, and Malu narrowly escape a carnivorous predator, a Tyrannosaurus-like menace that underscores the peril of this uncharted realm. Back at their camp, their colleagues have vanished, and a stark discovery awaits—two neighboring tribes, one painted with skeletal motifs, conduct human sacrifices to the very carnivorous creatures that stalk the land. Malone hatches a distraction to buy time, enabling the others to flee toward a second village where the inhabitants wear clothes instead of paint. Through Malu’s translations, the explorers learn a history of division within the tribes—shamans once coaxed some members into venerating the dinosaurs, fracturing the community long ago.
Summerlee, applying his scientific lens, hypothesizes that the strange necklaces worn by the sacrificial participants provided essential nutrients or immunization that allowed these dinosaurs to endure in a world otherwise dominated by extinction. The expedition ultimately seeks to use modern knowledge to benefit the lost world’s people: irrigation and horticulture are introduced to stabilize their environment, and a cure emerges for a prehistoric plague threatening the tribes. The skeletal tribes’ leader is slain, the warring factions reunite, and the chief reveals a concealed cave that promises a return route to their own world, urging the team to come back if they are ever needed again.
On the return to the river, the group is ambushed by Gomez. Wounded, Gomez is left to the jungle with the chilling directive, > Let the jungle have him. < Malu remains in Africa, choosing to stay, while Malone, Jenny Nilson, and Jim sail back home. In London, the Royal Zoological Society remains unconvinced by Challenger and Summerlee’s claims until Jim reveals a baby pterodactyl he has brought back, a tangible proof that their tale is more than mere fantasy. The team celebrates their achievement, yet the newly discovered creature Percival is not content to be confined to a zoo, and in a pivotal moment they decide to release him back to the lost world, where his true home awaits.
