 After a science lab explodes, MacGyver is asked to rescue scientists that are trapped underground, guarded by a deadly security system. He must do this before the nervous Army detonates a nuclear warhead at the lab, to stop the leak of highly concentrated acid that has begun to eat away at the concrete encasement of the underground bunker. MacGyver is able to fix the leak using a very unusual tool- chocolate. But neither the Army nor the officials above ground know of his accomplishment. Now, MacGyver has only two minutes remaining before the Army will launch the warhead...