The Lost Tribe follows the story of a group of friends who are out on a yacht trip when they come across a mysterious stranger who they believe has drowned. They pull him aboard and try to revive him, but he's in a state of shock and unable to communicate. As they try to figure out what to do with him, the stranger suddenly takes control of the yacht and steers it in a different direction. He doesn't seem to have a clear plan, and the yacht ends up crashing onto a rock and sinking.
The friends manage to escape onto a nearby island, but they soon realize that they're not alone. The island is inhabited by a strange and dangerous tribe, and the friends must band together to survive and find a way to escape.
As they try to contact the coast-guard through the radio, strange things start happening to the group. The body of the stranger they rescued disappears from his grave during the night, and then Tom, one of the friends, also disappears under mysterious circumstances. The remaining friends are left to fend for themselves and face the dangers of the island, not knowing who they can trust and whether they'll ever be rescued.
As they navigate their way through the unknown territory, they uncover the dark secrets of the tribe and realize that they're in a fight for survival that they may not be able to win. The Lost Tribe is a thrilling survivalist movie that will keep you on the edge of your seat until the very end.