Episodes Seriesįour crewmembers from the USS Enterprise switch places with their Mirror Universe counterparts and must get home while avoiding being discovered by the Mirror Universe crew of the Enterprise. The episode popularized the trope of using a goatee as a visual marker for an evil version of a character. Nazi-style military salutes were used by crewmembers to show loyalty to their captain.

Officers were barbaric in behavior and advanced in rank by killing superiors who they thought were incompetent. Discipline aboard starships was enforced through agony booths and agonizers carried by crewmembers.

The Mirror Captain Kirk of the ISS Enterprise was a mass murderer who was promoted to Captain after assassinating Captain Christopher Pike. The Mirror Universe was first introduced in the original Star Trek episode ' Mirror, Mirror', which featured a brutal Empire, managed by humans and their Vulcan allies, in place of the United Federation of Planets. Television appearances The Original Series

In Star Trek: Discovery, it is stated that humans from the Mirror Universe suffer from photophobia (a sensitivity to light). Humans in the Mirror Universe are typically referred to as 'Terrans'. Whereas the Star Trek universe depicts an optimistic future in which the Earth-based United Federation of Planets values peace, co-operation and exploration, episodes set in the Mirror Universe feature the human-dominated authoritarian Terran Empire which values war, despotism and conquest instead. The characters in the Mirror Universe are aggressive, mistrustful and opportunistic in personality.

The Universal Mirror by Gwen Perkins