Your starship is out in deep space. There's a sensor contact. An alien ship is approaching. I like the way 'The Corbomite Maneuver" handles it: the mere fact of running into an extraterrestrial ship is a big deal and commands our full attention in itself. There's a sense of mystery and danger involved. The alien is alien. The heroes are encountering something new, they don't know what to expect, and nobody is jaded about it. "Balance of Terror" and "Arena" are in this category. [WNMHGB has a great sense of running into the unknown, at least. The Barrier may or my not be an alien.]
The opposite approach comes later, an extreme case being "The Enterprise Incident." The alien is just a foreign power we're totally familiar with, or a people so human we might as well already know them, sometimes even to the point of being able to impersonate and infiltrate them. Nobody is mystified or amazed; encountering E.T. is routine. They're just like us and we know it. "The Apple" and "Friday's Child" are prime examples. Alien contact is a day at the office.
I don't like having the heroes always stuck on the weakest ship in the galaxy (Star Trek: Enterprise), but space seems bigger and more exciting when we aren't so ready for it, we aren't jaded about aliens, and we don't know what's out there. Falling into the routine of known (or "just like us") aliens is possibly an unintended consequence of Star Trek as a weekly series premise, and for me it can drag down the realism / excitement a little.
The opposite approach comes later, an extreme case being "The Enterprise Incident." The alien is just a foreign power we're totally familiar with, or a people so human we might as well already know them, sometimes even to the point of being able to impersonate and infiltrate them. Nobody is mystified or amazed; encountering E.T. is routine. They're just like us and we know it. "The Apple" and "Friday's Child" are prime examples. Alien contact is a day at the office.
I don't like having the heroes always stuck on the weakest ship in the galaxy (Star Trek: Enterprise), but space seems bigger and more exciting when we aren't so ready for it, we aren't jaded about aliens, and we don't know what's out there. Falling into the routine of known (or "just like us") aliens is possibly an unintended consequence of Star Trek as a weekly series premise, and for me it can drag down the realism / excitement a little.