Spock (alternates)

Throughout the history of the universe, there have been multiple timelines, alternate realities and parallel universes that have all contained versions of Spock, as well as various clones and replicants.

Female Spock
In a parallel universe accessed through a quantum rift, the, was born as a female, also named Spock. All aspects of her life paralleled those of Spock, including her 23rd century Starfleet service aboard the Federation starship USS Enterprise as first officer and science officer during the 2260s.

Spock was intensely loyal to Captain Jane Tiberia Kirk, but did not hesitate to question Kirk's tendency to give risky orders, especially in cases where the Prime Directive was concerned. Aboard the Enterprise, Spock was involved in a relationship with Communications Officer Nnamdi Uhuro.

Around the year 2260, the Enterprise was involved in a conflict with. In the aftermath of this confrontation, the ship began a new exploration mission.

On stardate 2261.274, the Enterprise was performing a cultural survey of planet Kassen V, when Kirk overrode Spock's concerns and made an effort to end slavery between the two species of Kassen natives. 

Klingon Spock
In the quantum rift, a reality in which Spock was a Klingon briefly intersected with the reality of the Enterprise. 

Romulan Spock
In a study of alternate realities, scientist Armand St. John discovered untold unexplained realities where persons could exist as different species, but with parallel history to their primary universe counterparts. In one such universe, Spock was a Romulan soldier.