Phelps impersonates a blind FBI agent to protect an undercover man inside the syndicate. Phelps: Peter Graves. Deetrich: Jason Evers. Matula: Tom Bosley. Lawson: Harold J. Stone. Johnny Brown: Peter Brown. Casey: Lynda Day George. Barney: Greg Morris. Willy: Peter Lupus. Dr. Warren: Robert Patten. Hood: Dom Tattoli.