When a group of missionary aid workers in Myanmar disappear into the vast green inferno, vigilante Vietnam War veteran John Rambo (Sylvester Stallone) leaves his job as a Salween River boatman behind to accompany a group of mercenaries on a daring rescue mission. It‘s been twenty years since Rambo helped mujahedeen rebels fend off Soviet invaders in Afghanistan, and these days the former soldier lives a simple life in northern Thailand. But it‘s time now for Rambo to take up arms once more and mete out his own, unique, brand of justice. As the film opens, we are provided with a thumbnail sketch of the situation in Burma, where most of the action will take place. Here, he‘s after the old stand–by of a corrupt army led by a sadistic colonel, whose evil and cruelty are highlighted in brutal scenes where innocent peasants are slaughtered by the dozen. Rambo is minding his own business catching snakes when Michael (Paul Schulze) and Sarah (Julie Benz) enter his life. They‘re Christian missionaries on their way up river from Thailand to Burma and they would like Rambo to be their guide. The river trip doesn‘t go without incident, as a boatload of pirates threaten the lives of the missionaries and only Rambo can save them.