Spoilsport has a rather appropriate moniker, given that he spoils the fun of his partner Sureshot by being an equally good marksman. In a contest between an intelligent gun and an intelligent gunner, the gun gets a majority vote. His partner resents his interference, and in his turn, the Nebulan resents Sureshot for his lack of appreciation. It can't help that Sureshot is a jerk, of course, and presumably he never calls.