Revisit classic sci-fi TV shows that have stood the test of time, including The Twilight Zone and Star Trek: The Next Generation.

We rank the greatest sci-fi shows that are over five seasons long, including Rick and Morty, Doctor Who, and Star Trek: The Next Generation.

Each year, more and more sci-fi TV shows are released; however, out of the multitude of options, there are only a few that survive the test of time and become TV shows that can be rewatched over and o ...