When advising other authors, I always emphasize summarizing the main story conflict in your summary (otherwise known as your "story description" or 'pitch'), so that readers will know whether their interested in your stories or not. Thus, in your example, their description might read, "When kidnapped by aliens, < name of character > tries to prove his worth as a way of winning his freedom and a chance to return home once again."
Simply listing a few details at the start of the story is admitting that you have no consistent theme in your stories, and that you've never refined your stories to focus on essential elements, rather than just listing the various stops along the way.
It's akin to saying "We stopped in Cleveland, Phili and New Orleans" rather than saying "we had detailed discussions about mortality on the way to my father's funeral this summer."