Mirrorlyness!

In 2371, O'Brien's mirror counterpart Smiley, sneaks aboard DS9 to steal Defiant schematics. While there, he also aquires schematics for the Phoenix-X. Four and a half years later, in 2375, the mirror Phoenix-X is created, but quickly destroyed. The only person to survive is the Executive Commander of that vessel, James, who returns six and a half years later (a.k.a. the present, a.k.a. 2382) to capture the Phoenix-X in the original universe. With the crew hand-cuffed and taken prisoner aboard their own ship, James decides to bring the Phoenix-X into the Mirror Universe, where he intends on selling the crew as slaves for a position within the Klingon-Cardassian Alliance. Unfortunately, due to a quantum chemical imbalance within Seifer's symbiont, experienced during the Phoenix-X's encounter with the Narendra Temporal Rift, Seifer is unable to contain transformations and sentience brought about within his symbiont. It isn't long before his symbiont escapes him and begins, yet again, running a muck, and taking James' plan for itself.

Memorable Quotes
"Ugghh! Why did you bring me here???" "So it's true. You can't survive in the Mirror Universe..." "You have to--- take me back--"

- Seifer and James

"Well, well, well. Looks who's been demoted."

- Kugo

Guest Characters

 * Smiley from "Star Trek: Deep Space 9"
 * Quark as above.
 * Garak as above.
 * Side characters Enabran Tain and Dejar as above.

Background Information

 * The opening takes place when Garak was apart of the Obsidian Order in 2368. In that scene, plans to construct the Phoenix-X in Cardassian space are passed. This coincides with events in the short story "The Recruited".
 * The beginning of this episode also takes place accross and during the Star Trek: Deep Space 9 episodes "Destiny", "Prophet Motive", and "Visionary".
 * The episode has a short appearance of the mirror counterparts for Red, Armond, and Kayl, who all eventually are killed in 2375. This episode also explains that the counterparts encountered in "Pure Evil" were from the Mirror Universe, and that Iso Stars are direct doors to the Mirror Universe. Using this logic, then the parallel universe visited in "Secret Shuttles, Part II" was the Mirror Universe - aswell as the species the Nega'Jem, originating from there, are Mirror Universe counterparts to the Jem'Hadar.
 * Seifer's symbiont being genetically enhanced was done in the episode "Occurrence, Part I", where the symbiont was influenced by the Quantum state aswell and allowed to experience sentience and separation on its own.
 * The mirror IKS B'Chnah makes an appearance in this episode, aswell as the mirror Captain Menchez as a member of the Klingon-Cardassian Alliance.
 * The title of this episode pokes fun at Star Trek: The Original Series episode titles like "Operation - Annihilate!", making use of the exclaimation mark. The future episode trilogy "Temporal Doom!" will do the same.

Links
Episode 66 - "Mirrorlyness!"