Mirror Universe was first introduced to Star Trek in "Mirror, Mirror", an episode of Star Trek: The Original Series which aired on October 6, 1967. "Shattered Mirror" is the third of five Mirror Universe episodes of Star Trek: Deep Space Nine; the others are "Crossover", "Through the Looking Glass", "Resurrection", and "The Emperor's New Cloak". Reception In 2017, SyFy ranked this the fourth best of the seven Mirror Universe episodes of the Star Trek franchise aired by that date. References External links Star Trek: Deep Space Nine (season 4) episodes 1996 American television episodes Mirror Universe (Star Trek) episodes Television episodes directed by James L. Conway