For five decades, American agencies have stockpiled information on UFOs. So did their counterparts behind the iron curtain. Soldiers, scientists and spies all paint a disturbing picture of the KGB's secret campaign. The UFO encounter that almost sparked a nuclear war. The pair of MiG fighters that tried to shoot down a UFO - both jets blown out of the sky! Stunning proof that the Soviets recovered something not from this earth! Amazing film footage smuggled out of Russia. This exclusive investig...