Mannix/A Matter of Principle
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A Matter of Principle is the seventeenth episode of the sixth season of Mannix, and the one hundred thirty-ninth episode overall.
Co-Starring: Abe Vigoda (Anton Valine), Jack Knight, Ward Wood (Lt. Malcolm), Mel Novak (Elmo Bagley), Dorothy Neumann (Gertrude), Alex Gerry (Mr. Ziegler), Shirley O'Hara (Mrs. Ziegler), Gary Waynesmith (Otis)
Two eccentric, elderly sisters hire Mannix to find the careless driver who dented their car in a parking lot, unaware that the man is a hired killer.