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.

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.