- For the prime universe counterpart, see Spock.
- For the prime mirror universe counterpart, see Spock (mirror).
- For the counterpart in the timeline created by Nero's incursion, see Spock (alternate reality).
- For the counterpart in Star Trek: Phase II, see Spock (Phase II).
In the alternate mirror universe Spock was the first officer of the Dominion Grand Fleet starship DSS Enterprise. When the prime universe's James T. Kirk inadvertently switched places with his his doppelgänger, he attempted to influence Spock to reform this mirror universe, much like the attempts by the "primary" Kirk to influence the direction of the "primary" mirror universe. However, unlike the prime mirror universe, Kirk's attempts to cause reform failed and Spock was caught attempting to kill his Kirk. Spock was quickly executed after a show trial and succeeded as first officer by Hikaru Sulu. (Star Trek: Remington: "Reflection")