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What If is the eighteenth episode of the ninth season of JAG, and the two hundredth episode overall.
Starring: David James Elliott (Navy Commander Harmon Rabb, Jr.), Catherine Bell (Marine Col. Sarah MacKenzie), Patrick Labyorteaux (Navy Lt. Bud Roberts, Jr.), John M. Jackson (Navy Admiral Chegwidden)
Special Guest Star: Corbin Bernsen (Captain Owen Sebring)
Guest Starring: Andrea Thompson (Admiral Alison Krennick), Ben Murphy (John Farrow), John Wesley Shipp (Col. Marcus Sutter), Erica Gimpel (Varese Chestnut), Michael Bellisario (Midshipman Mikey Roberts), Larry Manetti (Stan Nadelman), Jay Acovone (General Montrose), Jennifer Parsons (Major Hilary Clayton), Ned Vaughn (Captain Rogers), Evan C. Kim (Lt. Wong)
and Isabella Hofmann (Meredith Cavanaugh)
Co-Starring: Lamont Holmes (Petty Officer)