A longer version was released in 1925 but cut in the 1930's.
In 2005 Best Entertaintment AG issued a German dubbed version (without titles), running about 80 minutes, on DVD. It is also available separately on some DVD compilations.
In 1948 Encyclopedia Britannica Films produced a 10 minute abridged version, under the title A Lost World, with some newly-shot live action scenes with an actor portraying Conan-Doyle himself as he narrates the story.
A near complete print was recovered in the Czech Republic and has undergone restoration by The Eastman House, This version is 92 minutes long.
In 1991, Lumivision Corporation and International Museum of Photography at George Eastman House copyrighted a version distributed on video Milestone Film & Video. It was produced by Scott MacQueen and had an original music score by R.J. Miller. Although the movie ran 64 minutes, stills were used for missing footage and additional material involving portions of early films about dinosaurs were included, so that the total time of the video was 100 minutes.
In 2000, Film Preservation Associates, Inc. copyrighted a restored version produced by Serge Bromberg and David Shepard using materials from 8 different sources. It had a music score compiled and directed by Robert Israel, and runs 93 minutes.