We don't get to see how they get back to occupied space, we don't see how they handle having the Klingons on board or the complete nightmare the human/Klingon relations are now. We don't get to know if Chekov still remembers the brother he never had. We don't know if the crewmen are still trapped below.

And we never will.

And this is why arc-based programming -- or at least programming where the episodes take place in some kind of temporal sequence, instead of in the eternal now of a push-the-reset-button series -- was such an awesome innovation.

(Actually, arc-based programming had been around for a long time already, but it was on daytime television, in the soap operas -- which were only watched by housewives and thus were not in any way innovative or significant.)