The explorers encounter a baffling new phenomenon, which threatens to destroy the plateau.
A discovery reveals more of Marguerite's connection to the Druids and drives a wedge between her and Roxton.
After touching her mother's pendant to a stone monolith, Veronica relives the last days she spent with her parents, discovering their fate and her own destiny.
While protecting a crate of iridium ingots that were stolen from the Royal Navy five years ago, Lt. Drummond captures Challenger.
Challenger is the first human to test his experimental substitute for food and winds up in a duel with apparitions from his own mind.
Three demons take the place of Challenger, Roxton and Marguerite and Finn is the only one who can free her friends and kill the demons.
When archaeologists are murdered on the plateau, each member of the Challenger expedition is a suspect.
Challenger experiments with a mysterious energy source, throwing the explorers into Earth's cataclysmic future.
An assassin linked to Marguerite's secret past drives her apart from Roxton and threatens the explorers' lives.
Veronica falls in love with a 19th century musician and may be destined to disappear in another dimension.
Death takes the form of a beautiful woman determined to claim Roxton's soul.
A meteor plunges the Plateau into a new ice age which threatens the world.
Suffering from the effects of a poison dart, a hallucinating Malone believes he's back in World War I.
A powerful witch is bent on destroying Challenger and his science.
Challenger develops a new way to power a balloon and when turbulence leads to its downfall, Malone makes a new friend in a female warrior.
Roxton is transported back to the American West and must clear his name before he and all of his friends die.
Roxton's former mentor appears on the plateau, bringing his tyrannical bag of tricks with him. Guest star Sean Taylor.
Malone becomes a sleuth after discovering a knife which is linked to visions of the infamous murders of Jack the Ripper.
To save Malone, Challenger and his team risk unleashing a supernatural killer.
An unstoppable hunter tracks Roxton after he is cursed by a guardian of a sacred burial ground.
Marguerite joins a trio of dashing bandits with a deadly secret.
A deadly airship crash traps Challenger and his team seven years in the past.
An escape route opens to the expedition when an airship lands on the plateau, but the mysterious pilot has other plans.
During a thunderstorm visions of Summerlee, their lost colleague, lead the friends to the brink of destruction.
Werewolves make life a nightmare in the treehouse; Challenger faces a scientific challenge when Malone turns beastly.
When Marguerite and Roxton kiss, the earth moves, and the explorers are launched on a wild treasure hunt.
When the explorers enter an ancient temple, they release supernatural forces which threaten to destroy them.
Roxton, Marguerite, Challenger and Malone are marked after touching an amulet, convincing them to return it to the cave.
Aliens capture Veronica and Malone, forcing them to work in the mines alongside androids that have developed humanlike emotions and individuality.
Roxton and Marguerite are jailed, accused of robbery after walking through a brilliant light on the far side.
Alex, a kobold, takes Roxton, Malone and Veronica prisoner; Holt is constructing a uranium generator to allow the kobolds to live above ground.
Challenger, Marguerite and Veronica follow hunters tracks through gas defenses, looking for Challenger.
Danielle crafts a voodoo doll of Roxton, putting him in her control.
Marguerite recognizes as a trophy hunter a man who claims to be part of a Zoological Society rescue party.
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.
Captured by lizard men, Malone, Marguerite and Roxton are forced to fight as gladiators in the arena.
Veronica unwittingly releases a savage giant from captivity, and Marguerite and the others must use all their talents to subdue him.
An ancient map outlines an escape route; now the adventurers must prove to skeptics all they have seen.
Dinosaurs are behaving oddly, but the crew knows something is really wrong when Marguerite is nice to everyone.
Roxton saves a young woman and steps right into Balar's trap.
At a haunted castle, the adventurers seem compelled to re-enact a romantic story of intrigue -- one that could end in death.
A plane full of 21st-century tourists crashes in the jungle, bringing with it dreams of rescue. With Peter McCauley, Rachel Blakely, William Snow and Jennifer O'Dell.
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.
The friends emerge from battle to find that one of their number is lost, and goons have enslaved a village.
Drakul and the Raiders shoot down the adventurers' balloon, beginning a game of cat and mouse.
A gypsy fortuneteller's visions eerily come true, leaving the band to fear for Malone's life. With William Snow, David Orth, Rachel Blakely and Jennifer O'Dell.
Roxton (William Snow) promises a teen's dying mentor to help the boy fulfill his destiny as savior of his people.
A dying Roxton (William Snow) makes an evil pact to regain his life and save Marguerite (Rachel Blakely).
Ramses, a vivified mummy, enlists Marguerite, Challenger and Malone to help him regain the Egyptian throne; a grieving dinosaur targets Summerlee.
Veronica reunites with her father; the team must fight Kartas, a bounty hunter after Veronica's father.
Travelers from the future arrive in the Lost World to manipulate history.
Challenger meets up with a former scientific rival; an old witch may have the key to an escape from the Lost World.
After slapping a young king, Marguerite must choose between instant death or marrying the boy.
The adventurers come upon the ruins of a civilization destroyed by an enormous explosion.
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.
Challenger, Malone and Marguerite find a subterranean civilization after being trapped in an abandoned mine.
Roxton, Challenger and Summerlee bring badly injured Malone to a magic healer in order to save his life.
A search for Veronica's parents leads to a paradise guarded by prehistoric creatures and filled with beautiful, talented immortals.
Druids worship Marguerite, who bears the mark of an ancient prophet; Veronica and Summerlee find a baby.
A vampire bite elevates Roxton's hunting instincts to a bloodthirsty level; a smitten native will fight Malone to the death for Veronica.
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.
In order to free Challenger from her tribe, the team must retrieve the bones of a warrior queen's husband.
Stung by a giant bee, Summerlee lies near death; Challenger seeks a way to repel an attack by the ape-men.
When Roxton is running from a tyrannosaur, the earth suddenly swallows him up; the party follows a river to an underground ocean.
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.
Scientist and explorer George Challenger learns from a dying colleague of a prehistoric world and organizes an expedition to find it.