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In an alternate universe, where the universe is ruled by the imperialistic Terran Empire, Commander Archer is the first officer of the I.S.S. Enterprise
, serving under Captain Forrest. Archer wants Forrest to take the ship into Tholian space, where there may be a ship that can provide valuable technology to the Empire. But Forrest rejects his idea, thinking Archer is only trying to gain power. The determined Archer does not give up and recruits Major Reed and Sergeant Mayweather to stage a mutiny. Archer not only wants control of the ship, but also wants Forrest's lover, Hoshi, and hopes this mission in finding this ship can lead to him gaining more power in the Empire.
The Defiant seen here is actually the same ship Captain Kirk and his crew went to investigate in Star Trek: The Original Series episode, "The Tholian Web". The ship was caught between spatial interphase and then faded... to the mirror universe seen in this episode.
Commander Tucker (mirror): (to T'Pol (mirror)) You don’t want to end up like me, do you? I’ve absorbed enough delta rays to guarantee my grandchildren glow in the dark.
Commander Tucker (mirror): I did you a favour once.
T'Pol (mirror): We agreed never to discuss that.
Commander Tucker (mirror): And I haven't.
T'Pol (mirror): I'd hardly call it a favour, you enjoyed yourself.
Commander Tucker (mirror): Several times as I recall. So, how many years is it 'til your pon farr comes around again?
Captain Forrest (mirror): This isn't like you, Jonathan. You never lusted for power and glory. That's why I trusted you at my side all these years. Because you have no ambition!
Dr. Phlox (mirror): (to the Tholian) Will you kindly die?