Full Fathom Five, based on the novel by Bart Davis, is set in the days preceding the United States invasion of Panama in 1989. USS Aspen, a fictional Los Angeles-classsubmarine, rescues agents from Panama, and Peter MacKenzie (Michael Moriarty), the submarine's commanding officer, promptly falls in love with the beautiful Justine (Maria Rangel). Meanwhile, Panamanian rebels seize a Soviet submarine (the "Victor Three class submarine CCCP Kirov") and threaten America with a nuclear attack on Houston, Texas. Only MacKenzie and his crew can stop the villains.