In an attempt to discover new galaxies and planets, a great scientist named Kirk, go on a space journey, accompanying a group of 450 of men and women, the thing that brings terrible for them, because of the challenges and dangers they face in facing the mysterious death of them because of the lack of salt in their bodies.
Despite the modest budget necessitating some daft-looking species, occasionally wonky sets and amusingly clumsy shifts between the stars and their stunt doubles, many of the stories offered thoughtful science-fiction that tackled ethical issues.
And though the message of peace, progress, and tolerance may seem corny today, I happen to think those are still good ideas. Granted, when you judge it purely as television, the Original Series is a bit weak.
Fortunately, the series also had a murderer's row of writing talent that included Harlan Ellison, Robert Bloch, Richard Matheson, and Theodore Sturgeon, as well as characters that might not have been conceived as icons, but easily became them.