The Lost World (1925) Willis H. O'Brien's masterpiece of stop motion effects creates realistic prehistoric dinosaurs in this thrilling action adventure with a live orchestra and sound effects team! CRITICS AGREE: With a rare 100% on Rotten Tomatoes, THE LOST WORLD ushered in a new way of adventure movie-making. As soon as the thrilling sequences are reached, where the explorers are seen in the supposed habitat of the living dinosauri, brontosauri, allosauri and other prehistoric monsters, there is no end of excitement. Mordaunt Hall, New York Times, 1925 NOW ACCOMPANIED BY A LIVE ORCHESTRA!