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