Log Entry:
* Medical Log, Supplemental - Major Kira and I are returning home after opening a hospital on New Bajor, the first Bajoran colony in the Gamma Quadrant.

(The mirror Quark is brought away to be executed)
Mirror Garak: I will miss him. He always let me win at Dabo.

The Mirror Universe: "Mirror, Mirror"
This is the first time since the Star Trek episode "Mirror, Mirror" that the Mirror Universe has been seen. The events of "Mirror, Mirror", in which Captain James T. Kirk has a great impact on the Mirror Universe Spock, shape the effects upon the Mirror Universe that are first seen here, one hundred years after the events of the aforementioned episode. Coincidentally, "Crossover" occurs in the same season of Star Trek: Deep Space Nine as "Mirror, Mirror" in the original Star Trek series.

"Crossover": Mirror Universe
The events that occur between the two universes of Star Trek, starting here in Star Trek: Deep Space Nine and continuing the storyline from the original Star Trek series episode "Mirror, Mirror", will be expanded upon later in the series with the season three episode "Through the Looking Glass", the season four episode "Shattered Mirror", the season six episode "Resurrection", and the season seven episode "The Emperor's New Cloak".