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The Formula is the eighteenth episode of the fifth season of Matlock, and the one hundred ninth episode overall.
Guest Stars (in alphabetical order): Christian Clemenson (Dr. Tim Crider), David Froman (Lt. Bob Brooks), Carol Mayo Jenkins (Dr. Doris Massler), James Karen (Ed Billings), Joe Mays (Jerry Hughes), Charlie Stratton (Jeff Duvall)
Co-Starring: Steve Archer (Security Guard), Patricia Daniels (Denise), Earlene Davis (Jury Foreperson), Arthur Eckdahl (Judge Harrington), Morgan Hunter (Dr. Ingersol), Pamela Kosh (Housekeeper), Nancy Sullivan (Mrs. Crider)
The inventor of a special hair tonic needs Ben's help--he's accused of killing the chemist who stole his idea.