Mac's old friends, the bounty-hunting Colton brothers try to find a young woman who's the only witness to a Chinatown murder, aided by their wise and patient mother, their impatient younger brother and their dog, Frog.

While researching his family's genealogy, MacGyver discovers that his family name was disgraced during the Middle Ages. He is then knocked unconscious and, not surprisingly, is transported through dreams to the time of King Arthur. Here he must confront some stubborn knights, convince Arthur that he is a friend, and set out in search of his forefathers.