Professor Challenger leads a team of scientists and adventurers to a remote plateau deep within the Amazonian jungle to investigate reports that dinosaurs still exist there. **Cast:** - Michael Rennie as Lord John Roxton — An experienced big-game hunter who joins the expedition. - Jill St. John as Jennifer Holmes — The daughter of the owner of the Daily Gazette. - David Hedison as Ed Malone — A journalist at the Daily Gazette who volunteers to join the expedition. - Claude Rains as Professor George Edward Challenger — The famously short-tempered leader of the expedition. - Fernando Lamas as Manuel Gomez — The expedition's guide. - Richard Haydn as Professor Summerlee — A rival of Challenger's who joins the expedition. - Ray Stricklyn as David Holmes — The confident and brave brother of Jennifer Holmes and the son of Malone's boss, Stuart Holmes. - Jay Novello as Costa — Gomez's cowardly and selfish assistant who also helps guide the expedition. - Ian Wolfe as Burton White — A professor who ventured into the Amazon Plateau a couple of years before Challenger's expedition. - John Graham as Stuart Holmes — Edward Malone's employer and the father of Jennifer and David Holmes. - Colin Campbell as Prof. Waldron — The employer of Professor Challenger and Professor Summerlee, who organizes the expedition. - Vitina Marcus as the Native Girl — A native girl found on the plateau by the expedition. **Runtime:** 97 minutes