"As the story develops, the stakes increase. While Episodes later in the game don't take longer in terms of time or the number of in-game objectives, the plot itself accelerates to a dramatic pitch. The threats you'll face are as great as any you've seen in the Star Trek movies. That's not to say early missions are anything to scoff at, however; the early Episodes are designed to be intriguing and dangerous, too.
The Episodes are based on conflict, much like the main storylines in the Star Trek franchise. Conflict drives drama - will your negotiations with the captain of a Klingon Bird of Prey break down and come to blows? How far do you need to go to apprehend a spy on another vessel? 2409 is a time of war, which means even the most resolute captains will need to make tough choices and come to blows to ensure the survival of their faction.