In 1968, Nikolai Orlov, armed with information about the future, forms a unique special unit “Thunder,” equipped with advanced technologies. Their tactics—unfamiliar for that time—shock their colleagues, and actions in Vietnam have a significant impact on the course of world events. The main intrigue is what consequences such intervention in the past could bring. Using his knowledge, Orlov introduces modern counter-terrorism methods, and the elite fighters are sent back to Vietnam to radically change the course of history.