In San Francisco, the wealthy William T. Kolderup wins an auction against Taskinar and buys an island for US$ 5 million. Then he asks his grandson Jeff Morgan to get married with his beloved fiancee Meg Hollaney, but Jeff tells that he would like to spend one year traveling around the world before marrying Meg. Kolderup agrees and sends Jeff with Professor Thomas Artelect in a steamship of his own to the island he has just bought. One night, Jeff and Artelect find that the ship is on fire and the captain and crew dead, attacked by strange creatures, and they jump in the water and see the vessel exploding. They wake up on a beach of an island and look for supplies and a place to stay. But soon they stumble upon cannibals, prehistoric monsters, gold and pirates in an unforgettable adventure.
—Claudio Carvalho, Rio de Janeiro, Brazil