- Author's Saving Throw: Given that past "early bird" appearances by characters and concepts (i.e. the Ferengi and Borg in Star Trek: Enterprise; Harry Mudd in an earlier episode of Discovery) led to some fans crying canon violation, this episode includes a scene establishing why Captain Kirk and his crew had no prior knowledge of the Mirror Universe in the Star Trek: The Original Series episode "Mirror, Mirror"—Starfleet classified it at the highest levels to prevent anyone from attempting to go there. The same is true for the other side. The knowledge of the Defiant is also classified in the Empire, and no one alive knows about the Discovery.
Trivia / Star Trek: Discovery S1E14 "The War Without, The War Within"