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!

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 Lost World is in the grip of a crippling drought. Our adventurers are saved from a pack of thirsty Raptors by a magnificent young woman who begs them to escort her to her pueblo. She confesses that she is a survivor of the original colony, which had discovered the Fountain of Youth. Her supply is diminishing, however, and she must return to the Fountain cave--or die. Marguerite, with visions of eternal youth and wealth, leads the others after Ana.

Roxton and Marguerite return to the treehouse to find it raided by a monkey. They follow the monkey to a cave where they find an amulet that leaves a mark of a dinosaur skull on their hands. Those infected with the mark soon begin to morph into their "animal" selves