The 20 Best Episodes of 'Star Trek: The Original Series'

In the more than 50 years since Star Trek made its debut on NBC, the franchise has seen more than a dozen feature films and has its sixth spinoff series on the way later this month with CBS All Access' Star Trek: Discovery. For all the many amazing stories told in the decades to come, it's hard to beat the original Star Trek. Running for just three seasons, the series has become synonymous with the science fiction genre and emerged a cultural touchstone that has entertained, educated and inspire...