Mike and KITT rev up to rescue a snatched foreign ambassador from the clutches of a deranged terrorist. Elsewhere, Sarah and Dr. Graiman team up to repair a damaged robot.

A downcast Sarah skips town in the wake of a tragic family event, and Mike's subsequent search for her yields intriguing answers about his nebulous past. Meanwhile, the NSA gets a green light to activate KITT's evil nemesis, KARR, prompting outrage in Mike and the gang.