The Lost Tribe

When Tom, his girlfriend Alexis and his friends are on Joe's yacht, they rescue a wounded drowned man in shock. During the night, the stranger overrides the automatic pilot and steers the vessel to change the direction; however he accidentally wrecks on a rock and the vessel sinks. The castaways reach a beach in an island and try to contact the coast-guard through the radio. However, during the night, the body of the stranger vanishes from the grave and then Tom also disappears.