It would be understandable to describe “Space Seed” as a prequel to Star Trek II: The Wrath of Khan, given the way that film looms large in the franchise’s history. But there’s a reason that Nicholas Meyer chose Khan as the TOS villain to bring back for a movie. It’s because “Space Seed” is a really, really good episode of Star Trek.

The fourth live-action "Star Trek" TV show made some mistakes along the way, but it was arguably held back by the time it was made

Ready to settle in and watch some 'Star Trek' episodes? As there are so many, we've ranked all of the different series to help you get started on your quest.

Voyager debuted on UPN. A unique version of Star Trek, this bridge was led by a female captain whose authority was unquestionable. Captain Kathryn Janeway [Kate Mulgrew] owned that bridge, and the crew that helped Voyager make its way across the Delta Quadrant were some of the best on a Star Trek show.