O Mundo Perdido
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Michael RennieLord John Roxton
Jill St. JohnJennifer Holmes
David HedisonEd Malone
Claude RainsProf. George Edward Challenger
Fernando LamasManuel Gomez
Richard HaydnProf. Summerlee
Ray StricklynDavid Holmes
Jay NovelloCosta- Vitina MarcusNative Girl
Ian WolfeBurton White
Colin CampbellProf. Waldron (sem créditos)- John GrahamStuart Holmes (sem créditos)
Larry ChanceIndian Chief (sem créditos)
Bert StevensReporter at Airport (sem créditos)
Al BainMan at Airport (sem créditos)
Bess FlowersGuest at Zoological Institute Forum (sem créditos)
Kenner G. KempGuest at Zoological Institute Forum (sem créditos)
Cosmo SardoGuest at Zoological Institute Forum (sem créditos)- Murray PollackGuest at Zoological Institute Forum (sem créditos)