"Great chunks of Doyle's plot are discarded and replaced with dramatic dinosaur scenes. And this is what makes The Lost World so memorable and important to the development of fantasy on screen. Sure, by modern CGI standards O'Brien's stop-motion animation is at times jerky and primitive, but these scenes are still impressive. O'Brien and his team employed techniques of animation and monster-creation that he later perfected in King Kong, and even today the dinosaurs of The Lost World are among the best ever put on screen... It built the mold for much of what came afterward, and those of us who enjoy fantastical films have much to thank it and Willis O'Brien for." - Mark Bourne, The DVD Journal