https://www.cbr.com/star-trek-paved-way-for-darker-sci-fi-tv/

Before Star Trek, science-fiction was careful not to cross lines, especially on TV, but TOS launched a new directive that would changer TV forever.

5 Mandatory Star Trek Episodes You Can't Skip (https://www.cbr.com/star-trek-must-watch-episodes-list/)

Star Trek has hundreds of great episodes, but only a handful remain must-watch episodes for any fan of the franchise.