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Imposter is the twentieth episode of the third season of JAG, and the fifty-seventh episode overall.
Starring: David James Elliott (Navy Lt. Commander Harmon Rabb, Jr.), Catherine Bell (Marine Major Sarah MacKenzie), Patrick Labyorteaux (Navy Ensign Bud Roberts, Jr.), John M. Jackson (Navy Admiral Chegwidden)
Guest Starring: Peter Murnik (Clark Palmer), Sam Hennings (Lt. Col. Ronald Vickers), Stephen Macht (James Gribaldi), Harrison Page (Rear Admiral Stiles Morris), Larissa Laskin (Corporal Sharon Dupree), James M. McBride (Captain Pasternak), Mark Carlton (Undersecretary Darrel Spratt), Marilyn Tokuda (Dr. Oh), Tony Noakes (Special Investigator Dwight Burgess)