Unknown Island is a 1948 adventure film directed by Jack Bernhard and shot in Cinecolor. The film features monsters such as dinosaurs and a giant sloth and stars Virginia Grey, Phillip Reed, Richard Denning and Barton MacLane. Ray Corrigan also appears in this film, playing a Giant sloth. It also has the giant sloth fight and kill a Ceratosaurus identified as a Tyrannosaurus rex in the movie.