In this video tutorial, viewers learn how to watch Star Trek: The Original Series online for free. Begin by opening your internet web browser and go to the You Tube website. Then click on the Shows tab on the top of the page. Now click on the Most Popular tab and select Science Fiction under Shows in the sidebar. Then select Star Trek: Original Series and select the episode that you wish to watch. This video will benefit those viewers who are Star Trek fans, and would like to learn how to watch the original series for free to save money and be provided with entertainment.