Unknown Island

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. A deleted extended scene shows a Brontosaurus watch as the dinosaur and sloth fight in a lake nearby it can be found on the BBC Motion Gallery but the footage is in black and white due to the lack of colour film during the period of austerity immediately following the Second World War.

They sail aboard Tarnowskis ship, heading for weeks in the direction of French Polynesia, where the island is supposed to be located. During the voyage, it becomes clear that Fairbanks is obviously becoming attracted to Carole, even though she is the fiancee of Osborne. Tarnowski acts mad at Fairbanks because he is afraid of the dinosaurs, and that the island might not be a safe place for Carole.However, unknown to almost everyone, a group of unfriendly natives have been hiding in the hold of the ship. Before the crew reaches the island, they mutiny and attack the crew. Fortunately, they lose the fight and afterwards agree to help them on the island. ........

Source: Wikipedia