Early 20th-century adventurers find themselves fighting for survival after their hot-air balloon crashes into a remote part of the Amazon, stranding them on a prehistoric plateau.
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Scientist and explorer George Challenger learns from a dying colleague of a prehistoric world and organizes an expedition to find it.

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 a devil after he revives a drowning child.

A vampire bite elevates Roxton's hunting instincts to a bloodthirsty level; a smitten native will fight Malone to the death for Veronica.

Druids worship Marguerite, who bears the mark of an ancient prophet; Veronica and Summerlee find a baby.

A search for Veronica's parents leads to a paradise guarded by prehistoric creatures and filled with beautiful, talented immortals.

Roxton, Challenger and Summerlee bring badly injured Malone to a magic healer in order to save his life.

Challenger, Malone and Marguerite find a subterranean civilization after being trapped in an abandoned mine.

Roxton changes the lives of the Tintas when he kills a warrior from the Hikari tribe; a World War I flying ace crashes in the jungle and takes Marguerite, Malone and Summerlee as prisoners.

The adventurers come upon the ruins of a civilization destroyed by an enormous explosion.

After slapping a young king, Marguerite must choose between instant death or marrying the boy.

Challenger meets up with a former scientific rival; an old witch may have the key to an escape from the Lost World.

Travelers from the future arrive in the Lost World to manipulate history.

Veronica reunites with her father; the team must fight Kartas, a bounty hunter after Veronica's father.

Ramses, a vivified mummy, enlists Marguerite, Challenger and Malone to help him regain the Egyptian throne; a grieving dinosaur targets Summerlee.

A dying Roxton makes an evil pact to regain his life and save Marguerite.

Roxton promises a teen's dying mentor to help the boy fulfill his destiny as savior of his people.

A gypsy fortuneteller's visions eerily come true, leaving the band to fear for Malone's life.

Drakul and the Raiders shoot down the adventurers' balloon, beginning a game of cat and mouse.

The friends emerge from battle to find that one of their number is lost, and goons have enslaved a village.
While Roxton, Malone and Challenger are looking for a way off the plateau, Amazon women save them from an attack by a flock of pterodactyls.
A plane full of 21st-century tourists crashes in the jungle, bringing with it dreams of rescue.
At a haunted castle, the adventurers seem compelled to re-enact a romantic story of intrigue -- one that could end in death.
Roxton saves a young woman and steps right into Balar's trap.
Dinosaurs are behaving oddly, but the crew knows something is really wrong when Marguerite is nice to everyone.
An ancient map outlines an escape route; now the adventurers must prove to skeptics all they have seen.
Veronica unwittingly releases a savage giant from captivity, and Marguerite and the others must use all their talents to subdue him.
Captured by lizard men, Malone, Marguerite and Roxton are forced to fight as gladiators in the arena.
A woman who has saved the band from thirsty raptors will die if she cannot return immediately to the cave of the fountain of youth.
Marguerite recognizes as a trophy hunter a man who claims to be part of a Zoological Society rescue party.
Danielle crafts a voodoo doll of Roxton, putting him in her control.

Challenger, Marguerite and Veronica follow hunters tracks through gas defenses, looking for Challenger.

Alex, a kobold, takes Roxton, Malone and Veronica prisoner; Holt is constructing a uranium generator to allow the kobolds to live above ground.

Roxton and Marguerite are jailed, accused of robbery after walking through a brilliant light on the far side.

Aliens capture Veronica and Malone, forcing them to work in the mines alongside androids that have developed humanlike emotions and individuality.

Roxton, Marguerite, Challenger and Malone are marked after touching an amulet, convincing them to return it to the cave.
When the explorers enter an ancient temple, they release supernatural forces which threaten to destroy them.
When Marguerite and Roxton kiss, the earth moves, and the explorers are launched on a wild treasure hunt.
Werewolves make life a nightmare in the treehouse; Challenger faces a scientific challenge when Malone turns beastly.
During a thunderstorm visions of Summerlee, their lost colleague, lead the friends to the brink of destruction.
An escape route opens to the expedition when an airship lands on the plateau, but the mysterious pilot has other plans.

There's no escape for the Challenger Expedition when Captain Askwith's mysterious airship explodes in a fiery crash. But moments later, when Challenger, Roxton, and Marguerite appear on a British air station in 1915 -- on the same day the…
While searching for the missing Malone, Marguerite is saved from a cannibal attack by a dashing trio of bandits. Their leader, the elegant Francois Locke, invites her to join his band of thieves. Marguerite declines his offer, only to be…
While exploring a mysterious dinosaur bone yard, Roxton is attacked by a charging Ttriceratops and kills it, not out of necessity but in anger. However, the bone yard is actually a sacred animal burial ground, protected by a beautiful,…
An unsettling dream and a ghostly encounter convince Veronica that Malone is trapped in the spirit realm and needs her help to escape. At the same time, Assai and Challenger investigate a mysterious symbol burned into a field of grass,…
When Malone finds a knife, he is transported back to the East End of London in 1888, the scene of Jack the Ripper's brutal murders. In the nightmare of his visions, Malone sees his friends playing key roles in the crimes, both as…
Challenger, Malone and Veronica are exploring ruins on a riverbank, when a man stumbles out of the jungle in a hail of deadly arrows. Malone drags the wounded man to safety, who dies in their arms issuing a cryptic message to find a man…
When Roxton happens upon a hangman's noose dangling from a lonely tree in the jungle, he's suddenly transported back to the American West where he finds himself at the end of the rope. Facing him is Challenger, but in this world he's…
Challenger develops a new way to create lift in the balloon. All go along for a test flight, but the balloon is drawn into violent turbulence then crash-lands inside the vast caldera of an extinct volcano where our heroes find themselves…
When a powerful witch named Dame Alice feels threatened by Challenger's science, she calls upon her two beautiful acolytes to help undo his power. In order to earn full witchhood, the two must lure Challenger's ""guards"" - Roxton and…
When Keeran Raiders attack, a deadly poison dart forces Malone to relive a long-suppressed memory-his baptism of fire as a battlefield correspondent in World War I. Caught up in this nightmarish hallucination, Malone is once again an…
When a blindingly bright meteor strikes the Plateau, Challenger, Roxton, and Marguerite set out to investigate the impact site. But the closer they get, the colder the temperature becomes. As the explorers turn back, they discover what…
Ambushed in the jungle, Roxton narrowly escapes with his life only to learn that he has apparently cheated death once too often. The Grim Reaper, in the guise of a dark seductress - is determined to add his soul to her collection.…
Alone in the jungle, Veronica hears piano music and follows it to its source - a 19th century German village that has suddenly appeared in a fog choked valley. To her surprise, the handsome musician, Thomas Ducart, announces that he wrote…
A mysterious visitor attacks Veronica, leaving an enigmatic ivory tile as his calling card. But when Marguerite finds the tile, she hides it from the others because only she knows what it means… one of the deepest secrets of her past…
Using the Plateau's mysterious energy lines as a source of power, Challenger constructs a machine to send the explorers back to London. But when he, Roxton, and Marguerite find themselves in the same place they started from, they conclude…
When a lost archaeological expedition discovers a mysterious burial urn, the young student who opens it suddenly collapses in convulsions. Though she quickly recovers, Professor Hamilton, the expedition's leader, suspects she's contracted…
Challenger, Roxton, and Marguerite take Finn to a cave where one year earlier a blinding light opened a doorway to another reality. Once inside, the explorers witness an eerie apparition of a man Finn recognizes and fears. But when Finn…
Hoping to end starvation, Challenger becomes the first human subject to test his new experimental substitute for food. But his nutritional beverage is not as successful for him as it was for his lab mice, and he quickly becomes obsessed…
When Challenger discovers the wreckage of a World War I transport plane, he's captured by its pilot, Lieutenant Drummond. Drummond has been stranded for five years since the crash, protecting the plane's cargo—a crate of iridium ingots…
Led by a dream, Veronica touches her mother's pendant to a stone monolith. A flash of mysterious energy knocks her unconscious, causing her to relive her last days with her long-lost parents as a young girl. When she awakes, she's shocked…
A peaceful day of exploration turns deadly when a sudden explosion traps Marguerite and Roxton in an underground chamber. Their only hope for escape is Challenger, but the same explosion has left him with no memory of who he is, or what…
Two days before Challenger's latest attempt to leave the Plateau by balloon, Veronica and Finn encounter a strange phenomenon and are briefly transported into the post-apocalyptic future of New Amazonia. Soon after, Roxton finds himself…
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