Challenger, Malone and Veronica are searching for sulfur, in order to make more gunpowder, when they walk into a burial ground. They are attacked by warriors in black and white paint who capture Challenger. That night the group sneaks into the warriors' village...to find Challenger sitting quietly and drinking tea with a beautiful blonde woman named Cassandra. She and her husband had been part of an early expedition, also stranded and found by the warriors tribe twelve years ago; they were soon made king and queen there. She tells our group that going onto the burial grounds was considered taboo, and for this Challenger would have to remain captive for life. The only way they can save him is by going to the Cave of Fear and retrieving her husband's bones for burial. They set off, but soon discover why the cave is avoided ~ it's walls are covered in a hallucinogenic fungus, wtih a really nasty additional effect. It drives those affected to suicide - which Cassandra apparently knew when

Roxton, Marguerite and Malone are mapping a series of caves, trying to find one that leads off the plateau without much luck. Marguerite, all the while, has been gathering gleaming gemstones in her backpack. At least she will not go back empty handed. A fog begins to fill the air around them...dense...deep fog. From out of the mist forms take shape: cloaked figures and eerie rock formations, encircling a stone slab. They find themselves surrounded by Druid-like figures who swarm over Marguerite. Roxton tries desperately to protect her, but she is torn from his grasp. The two men are restrained and Marguerite is carried away and deposited on the stone slab. It turns out that Marguerite figures in an ancient prophecy and that her fate has finally caught up with her, here. What it means, she must discover for herself, but it involves retrieving a sacred jemstone. She, along with Roxton and Malone, must go through several obstacles like headhunters and a leap of faith to accomplish Marguer

While out in the jungle, Malone is hit in the neck with a poisoned dart and dies. A shaman, Lento, heals him and Malone is brought back to life, but Lento has been driven mad. He is sentenced to die by his village, but Malone rescues him. Summerlee is kept captive and will die unless Malone, Roxton and Challenger can bring Lento back. Lento leads them a merry chase, having booby-trapped the jungle, but the men do eventually catch up to him , and he is killed. In the meantime, back at the treehouse, Veronica and Marguerite have had a huge fight, and wind up down an old well, with a hungry dinosaur waiting for them above and snakes, water and each other, in the hole!

Challenger, Roxton, and Veronica come upon an old friend of Challengers, who resembles the sadistic ""creator"" Dr. Moreau. Elsewhere, Summerlee, Malone, and Marguerite meet an elderly woman who has a radio headset.

Though the explorers find a gateway that can transport them back home, following them are enemies: one who doesn't want them to return, and one who does but wants them to bring a deadly virus with them.

Deep in the jungle, Marguerite, Challenger and Malone come upon a half-buried, mummified corpse. They are shocked when it shows signs of life. They learn the would-be corpse, Ramses, is Egyptian royalty. He weaves a tale about a wonderful kingdom with untold riches and how he was to become king. He then enlists our heroes in a plan to reclaim the throne he says has been stolen from him by his sister, Nefertiti. After agreeing to help, the three discover there is more to the dispute than Ramses is revealing. He rules with an iron fist, enslaving his former enemies. He blinds his sister, and leave her to die. Marguerite, Challenger and Malone help her escape. The adventurers decide they must defeat Ramses by convincing the true heir, Nefertiti, to accept the responsibility of rule, and helping her regain control. Meanwhile, Summerlee is relentlessly pursued by a T-Rex after she mistakenly believes him responsible for the death of her babies. Roxton and Veronica must help their friend or

When the explorers rescue a fortune teller from her runaway horses, she tells them their future, which begins to come true little by little, but in a different way than they expect.

The explorers are caught in the middle of a war between Tribue, with gunpowder in toe, and Drakul and his barbaric raiders. One of them will be lost, possibly forever, when this battle reaches its cliffhanger!

Marguerite and Roxton are enjoying an intimate moment, when suddenly the earth moves! They find themselves sprawled in the bottom of a pit, with a pirate's skeleton and his cursed treasure chest filled with a fortune in booty. Unimpressed by a little curse, Marguerite takes it to the Treehouse. Challenger and Malone find the pirate's journal, and decide to unravel his story. Traveling to the described inland sea, they are ambushed by pirate descendant Pappin, who seizes the journal. He sends his men to find the treasure, then shackles Malone in a tidal cave, leaving Challenger tied up in his shack

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 known as Sheriff Jack Challenger, a cruel lawman who neither recognizes Roxton nor listens to his plea of innocence.

Saved by a rancher's widow, Roxton begins a strange journey to clear his name and find his way back to the Lost World. Along the way he runs into all of his friends but none of them recognize him -- Malone is a cold-hearted gunslinger, Veronica runs the local saloon and trading post, and Marguerite is the beautiful widow who saved Roxton's life. As Roxton struggles to make sense of it all, he is drawn to a final showdown in the saloon, where he must face his friends in a deadly shootout.

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 races from the cave, the three figures who follow are not her friends-they're Kayle, Una, and Rixxel, three demons who have taken the place of Challenger, Roxton, and Marguerite. If the demons can remain on the Plateau for two days, they will permanently replace the explorers, and Kayle will be free to bring chaos and destruction to the world.

In the final deadly showdown between Finn and the demons, Finn must make the decision of her life-save the future or save her friends. Until an unexpected sacrifice changes everything…

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 has happened to his friends.

Meanwhile, a contest of friendly rivalry between Veronica and Finn leads to an enigmatic discovery at the Treehouse, as another memory from Veronica's childhood is literally uncovered.

Faced with certain death, Roxton and Marguerite reveal emotions best left buried, so that even if they do survive their ordeal, there's a chance their relationship will not.