Exploring the galaxy back when it was still wild.
Parents need to know that humans don't always come off looking like the most competent race in this space opera. The show documents some of Star Fleet's early missions beyond the Milky Way, and most of the drama comes from the crew's frequent contact with new alien species. Some of these are friendly, some are wary, and some are immediately hostile; in many cases it's clear that mankind is the new kid on the galactic block, and we often have little concept of protocol. The thinly disguised contempt of some alien cultures (especially the Vulcans) toward the humans might prompt viewers to take a closer look at how people who think they're quite advanced present themselves to others who may have a different opinion.