The Original Series' highest-rated episodes are based around the same central premise, and there's a good reason for that.

For a series set in the 23rd century, there are elements of Star Trek: The Original Series that bear witness to the era in which it was made, and one of those elements is the costuming. Sure, the crew aboard the Enterprise look sharp in their Federation uniforms,

The Next Generation took significantly more risks with its plot, characters, and overall storytelling proving that is superior to the original.

The Original Series has the honor of playing 3 of Star Trek's most important alien species: Vulcan, Klingon, and Romulan.

The Original Series, Star Trek The Next Generation follows the crew of the U.S.S. Enterprise-D on their own voyage across the stars. Yet it stands on its own two feet, thanks to its incredible cast and the way it introduced and then built upon concepts and characters that would come to define the Star Trek universe for years.

If you watch Star Trek shows a lot, like I do, you start to notice some familiar faces. With decades of television shows and movies under its belt, it's only natural that the franchise has approached actors to play multiple roles over the years.