Starfleet's Prime Directive is a core aspect of its ideology, but one episode of Star Trek: The Original Series turned it into a farce.

As the leading man and central hero of Star Trek: The Original Series, it was in the show's best interests to make William Shatner's Captain Kirk look good. And, 99% of the time, it did exactly that.

Some Star Trek episodes entertain you. Others completely rearrange your brain chemistry. From moral gut-punches to genre-bending experiments and time-travel tragedies, these are the episodes fans ...

Star Trek's original Chekov actor breaks down why William Shatner's Captain Kirk really was a TV game-changer.