Unknown Island is great fun for those of you who love the old jungle adventure films. It boasts classic Hollywood jungle sets, carnivorous dinosaurs (portrayed by men in rubber suits), a giant sloth (played by Ray "Crash" Corrigan of movie gorilla fame), and a few truly chilling moments. Although the special effects seem crude by today's standards, fans of classic jungle serials, old gorilla movies, or dinosaur films will not be disappointed with this fun to watch 1948 feature.