Spock was a female cat that was likely the pet of a crew member on the UNSC Spirit of Fire. She was apparently impregnated by another cat while on board the ship.
Captain James Cutter thought that Spock and her pregnancy was a sign of good luck. Nurse Hershey had a feeling that Spock intended to give birth in her bed.
- Spock is most likely a reference to the Vulcan Star Trek character of the same name, Spock.