Spock

Spock was a female cat that was likely the pet of a crew member on the. She was apparently impregnated by another cat while onboard 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.

Trivia

 * Spock is most likely a reference to the Star Trek character of the same name, Mr. Spock, possibly due to the fact that Vulcans in the Star Trek universe, Vulcans possess triangular ears similar in shape to those of a cat.