Beamed up during an ion storm, which causes a transporter malfunction, the landing party of Kirk, McCoy, Scotty and Uhura find themselves in a mirror universe aboard a parallel Enterprise run by ruthless barbarians. The ion storm also caused their malicious counterparts to beam to the real starship. Kirk and the others must find a way home before they are discovered and exposed by their parallel crew members, who use treachery, back-stabbing and seduction to get what they want. Written by
Did You Know?
Star Trek was usually not allowed to show women's navels, but Uhura's navel is visible in the mirror universe. Reportedly, this was accomplished by filming while a PA took the Standards representative to lunch. See more
Poorly-placed camera angles reveal the fight sequence choreography between Kirk and the "mirror" Spock. On more than one occasion, very noticeable gaps are visible as they fight. See more
Captain James T. Kirk
This is a new race. They offer other things of value besides dilithium crystals.
But it is clear that we can not expect their cooperation. They refuse the Empire. Command procedure dictates that we provide the customary example.