

After MacGyver witnesses someone dumping toxic waste that's polluting mountain streams, he and Pete enlist a reclusive mountain man nicknamed "Earthquake" to help lead them to the culprit. Things become complicated, though, as Earthquake's flashbacks to his military service in the Vietnam War make him unstable and threaten their case.
While helping the People's Republic of China secure a priceless national treasure—The Ming Dragon—in a San Diego museum, MacGyver runs into a Lisa, a woman that he had loved and thought was long dead. MacGyver learns that Lisa has been alive all these years and needs his help escaping the KGB.