Guest Stars James Doohan as Lt. Cmdr. Montgomery "Scotty" Scott Nichelle Nichols as Lt. Nyota Uhura George Takei as Lt. Hikaru Sulu John Winston as Lt. Kyle William Shatner as Mirror Kirk Walter Koenig as Mirror Chekov James Doohan as Mirror Scotty George Takei as Mirror Sulu Leonard Nimoy as Mirror Spock Nichelle Nichols as Mirror Uhura Barbara Luna as Mirror Marlena Barbara Luna as Lt. Marlena Moreau Garth Pillsbury as Wilson Vic Perrin as Tharn Vic Perrin as Mirror Tharn John Winston as Mirror Kyle Pete Kellett as Farrell
